| ABCDEFGHIJKLMNOPQRSTUVWXYZ |
| r1 (1) |
| Equation: Graham's Law |
| r2 (1) |
| Equation: Graham's Law |
| ra (10) |
| Atomic data: Radium |
| Data1: Radium |
| Isotope: Actinium |
| Isotope: Francium |
| Isotope: Radium |
| Isotope: Thorium |
| Names: Sulfur |
| Production: Actinium |
| Reactions: Radium |
| Spectrum: Radium |
| ra+ (1) |
| Atomic data: Radium |
| ra+2 (1) |
| Data2: Radium |
| ra2+ (1) |
| Reactions: Radium |
| ra3n2 (1) |
| Reactions: Radium |
| rabi (1) |
| On This Day... 29 July |
| rabr2 (1) |
| Compounds: Radium |
| race (1) |
| Country: United States of America |
| racing (1) |
| Data1: Magnesium |
| rackets (1) |
| Data1: Boron |
| racl2 (1) |
| Compounds: Radium |
| radar (1) |
| Biography: Edwin Mattison McMillan |
| radars (1) |
| Data1: Yttrium |
| radcliffe (1) |
| Biography: Sir William Crookes |
| radiant (2) |
| Biography: Sir William Crookes |
| Glossary: Radiation |
| radiated (1) |
| Biography: Robert Wilhelm Bunsen |
| radiating (1) |
| Glossary: Alpha Decay |
| radical (4) |
| Biography: Antoine Alexandre Brutus Bussy |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Nitrogen |
| On This Day... 24 August |
| radically (1) |
| Glossary: Allotrope |
| radicals (4) |
| Compounds: Sodium |
| Data1: Oxygen |
| On This Day... 14 June |
| On This Day... 20 May |
| radij (1) |
| Names: Radium |
| radio (8) |
| Biography: Albert Ghiorso |
| Biography: Frederick Soddy |
| Compounds: Beryllium |
| Glossary: Radiation |
| Isotope: Actinium |
| Names: Radium |
| On This Day... 11 November |
| On This Day... 22 February |
| radiocarbon (2) |
| Isotope: Carbon |
| On This Day... 4 March |
| radiochemical (1) |
| Biography: Irene Joliot-Curie |
| radiochemist (3) |
| Biography: Andre Louis Debierne |
| Biography: Frederick Soddy |
| On This Day... 2 September |
| radiocontrast (1) |
| Data1: Gadolinium |
| radiogenic (1) |
| Production: Bismuth |
| radiographers (1) |
| Biography: Irene Joliot-Curie |
| radiography (3) |
| Data1: Cobalt |
| Isotope: Cobalt |
| Isotope: Ytterbium |
| radioiodine (3) |
| Compounds: Iodine |
| Data1: Iodine |
| Isotope: Iodine |
| radioisotope (5) |
| Compounds: Samarium |
| Glossary: Gamma Ray |
| Isotope: Iridium |
| Isotope: Strontium |
| Production: Rhodium |
| radioisotopes (9) |
| Data1: Americium |
| Data1: Curium |
| Data1: Einsteinium |
| Data1: Mendelevium |
| Data1: Neptunium |
| Data1: Protactinium |
| Glossary: Gamma Ray |
| Glossary: Spontaneous Fission |
| On This Day... 19 March |
| radiolabel (1) |
| Isotope: Hydrogen |
| radiological (1) |
| Data1: Radon |
| radiometer (1) |
| Biography: Sir William Crookes |
| radiometric (1) |
| Glossary: Spontaneous Fission |
| radionuclide (5) |
| Compounds: Iodine |
| Compounds: Technetium |
| Country: Outer space |
| Glossary: Abundance |
| Isotope: Nickel |
| radionuclides (1) |
| Compounds: Iodine |
| radiopharmaceutical (1) |
| Isotope: Strontium |
| radiotherapy (3) |
| Isotope: Cobalt |
| Isotope: Iridium |
| Isotope: Strontium |
| raffinate (1) |
| Production: Technetium |
| rahm (1) |
| Data1: Tungsten |
| rail (1) |
| Data1: Manganese |
| railroad (1) |
| Biography: Ferdinand Frederic Henri Moissan |
| rain (3) |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Sulfur |
| On This Day... 4 July |
| rainbow (1) |
| Data1: Iridium |
| rainbows (1) |
| Data1: Iridium |
| rainer (1) |
| On This Day... 14 January |
| rainwater (1) |
| Isotope: Iodine |
| raise (2) |
| Biography: Hans Christian Oersted |
| Glossary: Specific heat |
| raised (2) |
| Biography: Ida Eva Tacke Noddack |
| Production: Tantalum |
| raises (1) |
| Glossary: Convection |
| raising (2) |
| Compounds: Phosphorus |
| Glossary: Base |
| rajasthan (1) |
| Data1: Zinc |
| ralph (2) |
| Data1: Americium |
| Data1: Curium |
| raman (1) |
| On This Day... 7 November |
| rame (1) |
| Names: Copper |
| ramsey (3) |
| Data1: Helium |
| Data1: Krypton |
| Data1: Xenon |
| ramsperger (1) |
| On This Day... 21 July |
| ran (2) |
| Country: Oceans / Seas |
| Production: Gold |
| random (2) |
| Glossary: Gas |
| Glossary: Temperature |
| randomly (1) |
| Isotope: Plutonium |
| ranelate (1) |
| Compounds: Strontium |
| ranges (1) |
| Production: Uranium |
| ranging (4) |
| Compounds: Cadmium |
| Data1: Molybdenum |
| Data1: Neodymium |
| Glossary: Allotrope |
| rao (1) |
| Reactions: Radium |
| rao2 (1) |
| Reactions: Radium |
| raoult (1) |
| On This Day... 10 May |
| rapid (8) |
| Allotrope: Oxygen |
| Allotrope: Sulfur |
| Biography: Louis Jacques Thenard |
| Country: Outer space |
| Data1: Lead |
| Data1: Nitrogen |
| Data1: Oxygen |
| Glossary: Magic Number |
| rarer (2) |
| Data1: Praseodymium |
| Production: Hydrogen |
| rarest (9) |
| Compounds: Astatine |
| Compounds: Oxygen |
| Data1: Astatine |
| Data1: Gallium |
| Glossary: Double Beta Decay |
| Production: Astatine |
| Production: Francium |
| Production: Iridium |
| Production: Tellurium |
| rarity (5) |
| Country: United States of America |
| Data1: Neon |
| Production: Neon |
| Production: Tellurium |
| Production: Thulium |
| ras (2) |
| Country: Qatar |
| Country: United States of America |
| rasaratna (1) |
| Data1: Zinc |
| rasavatam (1) |
| Data1: Mercury |
| rash (1) |
| Data1: Aluminium |
| rashes (2) |
| Data1: Magnesium |
| Data1: Zinc |
| rasorite (2) |
| Country: United States of America |
| Production: Boron |
| rat (3) |
| Compounds: Barium |
| Data1: Barium |
| Data1: Thallium |
| rate (8) |
| Compounds: Boron |
| Data1: Palladium |
| Data1: Zinc |
| Equation: Graham's Law |
| Glossary: Heat Capacity |
| Glossary: Young's Modulus |
| On This Day... 16 December |
| Production: Oxygen |
| rates (1) |
| Allotrope: Carbon |
| ratified (4) |
| Data1: Lawrencium |
| Data1: Ununpentium |
| Data1: Ununquadium |
| Data1: Ununtrium |
| rating (3) |
| Data1: Holmium |
| Data1: Lutetium |
| Data1: Thulium |
| ration (1) |
| Reactions: Gold |
| ratios (3) |
| Data1: Rubidium |
| Glossary: Spontaneous Fission |
| Isotope: Strontium |
| ravenna (1) |
| Biography: Julius Caesar Scaliger |
| raw (3) |
| Compounds: Phosphorus |
| Data1: Tungsten |
| Production: Argon |
| rayleigh (4) |
| Biography: John William Strutt Rayleigh |
| Biography: Sir William Ramsay |
| Data1: Argon |
| On This Day... 12 November |
| rayon (1) |
| Compounds: Zinc |
| razor (1) |
| Data1: Cobalt |
| rb (8) |
| Atomic data: Rubidium |
| Data1: Rubidium |
| Data2: Rubidium |
| Isotope: Krypton |
| Isotope: Rubidium |
| Isotope: Strontium |
| Reactions: Rubidium |
| Spectrum: Rubidium |
| rb+ (2) |
| Atomic data: Rubidium |
| Reactions: Rubidium |
| rb+1 (1) |
| Data2: Rubidium |
| rb2o (1) |
| Production: Rubidium |
| rb2o2 (1) |
| Production: Rubidium |
| rb2o3 (1) |
| Production: Rubidium |
| rb2te (1) |
| Compounds: Rubidium |
| rbbr (1) |
| Reactions: Rubidium |
| rbcl (1) |
| Reactions: Rubidium |
| rbf (1) |
| Reactions: Rubidium |
| rbi (1) |
| Reactions: Rubidium |
| rbo2 (2) |
| Production: Rubidium |
| Reactions: Rubidium |
| rboh (1) |
| Reactions: Rubidium |
| rc (3) |
| Data2: Gadolinium |
| Data2: Indium |
| Data2: Thorium |
| rdx (1) |
| Compounds: Nitrogen |
| re+ (1) |
| Atomic data: Rhenium |
| re+1 (1) |
| Data2: Rhenium |
| re+2 (1) |
| Data2: Rhenium |
| re+3 (1) |
| Data2: Rhenium |
| re+4 (1) |
| Data2: Rhenium |
| re+5 (1) |
| Data2: Rhenium |
| re+6 (1) |
| Data2: Rhenium |
| re+7 (1) |
| Data2: Rhenium |
| re0 (1) |
| Data2: Rhenium |
| re2o7 (1) |
| Reactions: Rhenium |
| re3+ (1) |
| Reactions: Rhenium |
| reach (7) |
| Biography: (Gabriel) Daniel Fahrenheit |
| Biography: Robert Wilhelm Bunsen |
| Data1: Tantalum |
| Equation: Charles' Law |
| Glossary: Group |
| Glossary: Island of Stability |
| Production: Aluminium |
| reached (4) |
| Biography: Robert Wilhelm Bunsen |
| Data1: Gold |
| Data1: Tantalum |
| Glossary: Kelvin (absolute temperature) |
| reaches (4) |
| Compounds: Chlorine |
| Compounds: Sodium |
| Data1: Titanium |
| Equation: Charles' Law |
| reaching (3) |
| Allotrope: Oxygen |
| Biography: Albert Ghiorso |
| Country: Australia |
| reactant (1) |
| Glossary: Reagent |
| reactants (3) |
| Biography: Antoine-Laurent de Lavoisier |
| Glossary: Decay Energy |
| Glossary: Enzyme |
| reacted (2) |
| Production: Iodine |
| Production: Magnesium |
| reactives (1) |
| Data1: Nitrogen |
| read (3) |
| Biography: Michael Faraday |
| Compounds: Potassium |
| Data1: Technetium |
| reading (2) |
| Biography: Sir Humphry Davy |
| Glossary: Metalloids |
| ready (1) |
| Data1: Caesium |
| reagent (9) |
| Biography: George Charles de Hevesy |
| Compounds: Nitrogen |
| Compounds: Potassium |
| Compounds: Zinc |
| Data1: Bromine |
| Data1: Manganese |
| Glossary: Reagent |
| On This Day... 25 June |
| On This Day... 6 May |
| reagents (4) |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Nitrogen |
| Data1: Tantalum |
| Glossary: Aqua regia |
| real (5) |
| Biography: Julius Caesar Scaliger |
| Data1: Promethium |
| Data1: Radium |
| Equation: Avogadro's law |
| Glossary: Viscosity |
| realgar (2) |
| Country: Iran |
| Production: Arsenic |
| realised (3) |
| Biography: Irene Joliot-Curie |
| Compounds: Nitrogen |
| On This Day... 12 January |
| reality (2) |
| Glossary: Energy Levels |
| Glossary: Isotope |
| realize (1) |
| Biography: Joseph Priestley |
| realized (6) |
| Biography: Robert Wilhelm Bunsen |
| Data1: Fluorine |
| Data1: Molybdenum |
| Data1: Thorium |
| Glossary: Magic Number |
| Production: Fluorine |
| realizing (1) |
| Data1: Titanium |
| really (3) |
| Data1: Lead |
| Document: The Halogens (Group 17) |
| Production: Vanadium |
| realm (1) |
| Biography: Ida Eva Tacke Noddack |
| rearranged (1) |
| Biography: John Dalton |
| rearrangement (4) |
| On This Day... 14 January |
| On This Day... 22 July |
| On This Day... 27 March |
| On This Day... 27 May |
| reasonable (2) |
| Data1: Plutonium |
| Production: Uranium |
| reasonably (3) |
| Data1: Erbium |
| Data1: Sodium |
| Production: Thallium |
| reasoned (1) |
| Glossary: Electron Volt |
| reasoning (1) |
| Biography: Julius Caesar Scaliger |
| reb2 (2) |
| Compounds: Boron |
| Compounds: Rhenium |
| rebounded (1) |
| Production: Copper |
| rebounds (1) |
| Glossary: Enthalpy Change of Fusion (Heat of Fusion) |
| rebreathers (1) |
| Compounds: Lithium |
| rebuilt (1) |
| Production: Aluminium |
| recall (2) |
| Glossary: Periods |
| Glossary: Transactinides |
| recast (1) |
| Biography: George Charles de Hevesy |
| receive (1) |
| Biography: Enrico Fermi |
| receiving (2) |
| Biography: Karl Wilhelm Scheele |
| Biography: Robert Wilhelm Bunsen |
| recent (8) |
| Allotrope: Carbon |
| Country: Democratic Republic of Congo |
| Data1: Phosphorus |
| Data1: Terbium |
| Production: Nickel |
| Production: Rhodium |
| Production: Samarium |
| Production: Technetium |
| rechargable (1) |
| Compounds: Nickel |
| recipes (1) |
| Compounds: Potassium |
| recipients (1) |
| Biography: Robert Wilhelm Bunsen |
| recluse (1) |
| Biography: Henry Cavendish |
| recognise (1) |
| Biography: Johann Schroder |
| recognised (2) |
| Data1: Cobalt |
| Data1: Magnesium |
| recognize (5) |
| Biography: Baron Axel Fredrik Cronstedt |
| Biography: Julius Caesar Scaliger |
| Data1: Boron |
| Data1: Hydrogen |
| Data1: Manganese |
| recoil (4) |
| Biography: Peter Armbruster |
| Data1: Ununpentium |
| Data1: Ununtrium |
| Glossary: Spontaneous Fission |
| recoiled (1) |
| Data1: Lawrencium |
| recollection (1) |
| Biography: Emilio Gino Segre |
| recommend (1) |
| Production: Radon |
| recommendation (1) |
| Glossary: Electron Volt |
| recommendations (1) |
| Glossary: IUPAC |
| recommended (7) |
| Compounds: Sodium |
| Compounds: Zinc |
| Data1: Bohrium |
| Data1: Chromium |
| Data1: Hassium |
| Data1: Manganese |
| Data1: Seaborgium |
| recommends (3) |
| Glossary: Actinides |
| Glossary: Lanthanides (old name) |
| Production: Radon |
| record (5) |
| Biography: Joseph Louis Gay-Lussac |
| Data1: Copper |
| Data1: Technetium |
| Glossary: Temperature |
| On This Day... 8 November |
| recorded (1) |
| Biography: Michael Faraday |
| recording (1) |
| Compounds: Chromium |
| records (3) |
| Biography: Jöns Jacob Berzelius |
| Data1: Astatine |
| Production: Astatine |
| recover (8) |
| Country: Israel |
| Country: Jordan |
| Country: Oceans / Seas |
| On This Day... 7 March |
| Production: Gold |
| Production: Helium |
| Production: Lithium |
| Production: Terbium |
| recoverable (1) |
| Production: Thallium |
| recovers (1) |
| Country: Russia |
| recrystallization (1) |
| Data1: Hafnium |
| recrystallized (1) |
| Data1: Lanthanum |
| rectangle (1) |
| Document: Understanding Electron Configuration Tables |
| rectifiers (2) |
| Data1: Germanium |
| Data1: Selenium |
| rectifying (1) |
| Data1: Germanium |
| rector (1) |
| Biography: William Gregor |
| recuperation (1) |
| Biography: John William Strutt Rayleigh |
| recur (1) |
| Glossary: Periodic Law |
| recycle (1) |
| Biography: Robert Wilhelm Bunsen |
| recycling (5) |
| Production: Aluminium |
| Production: Cadmium |
| Production: Indium |
| Production: Lead |
| Production: Rhenium |
| reddish (5) |
| Biography: William Gregor |
| Compounds: Chlorine |
| Data1: Bismuth |
| Data1: Neodymium |
| Data1: Neon |
| redetermined (1) |
| On This Day... 11 April |
| rediscovered (7) |
| Biography: Charles Hatchett |
| Biography: Hennig Brand |
| Biography: Martin Heinrich Klaproth |
| Data1: Hydrogen |
| Data1: Niobium |
| Data1: Titanium |
| Data1: Vanadium |
| redistillation (1) |
| Production: Zinc |
| redistribute (1) |
| Biography: Michael Faraday |
| redondo (1) |
| Biography: Edwin Mattison McMillan |
| redox (2) |
| Data1: Europium |
| Production: Hydrogen |
| reduces (2) |
| Compounds: Magnesium |
| Production: Iron |
| reef (3) |
| Country: South Africa |
| Production: Palladium |
| Production: Platinum |
| reentry (2) |
| Allotrope: Carbon |
| Compounds: Hafnium |
| reese (1) |
| On This Day... 4 November |
| ref6 (1) |
| Reactions: Rhenium |
| ref7 (1) |
| Reactions: Rhenium |
| refer (6) |
| Biography: Michael Faraday |
| Data1: Francium |
| Data1: Manganese |
| Data1: Niobium |
| Glossary: Abundance |
| Glossary: Speed of Sound |
| refered (1) |
| Allotrope: Carbon |
| references (1) |
| Data1: Zinc |
| refine (1) |
| Data1: Titanium |
| refinement (3) |
| Biography: Joseph Louis Gay-Lussac |
| Production: Aluminium |
| Production: Hafnium |
| refineries (3) |
| Compounds: Fluorine |
| Production: Selenium |
| Production: Zinc |
| reflect (1) |
| Production: Yttrium |
| reflected (1) |
| Data1: Neodymium |
| reflecting (2) |
| Biography: William Hyde Wollaston |
| Compounds: Indium |
| reflection (2) |
| Allotrope: Carbon |
| Production: Tellurium |
| reflective (1) |
| Compounds: Titanium |
| reflectivity (3) |
| Data2: Mercury |
| Data2: Tellurium |
| Data2: Zinc |
| reflectors (2) |
| Data1: Germanium |
| Data1: Rhodium |
| reflects (2) |
| Biography: William Hyde Wollaston |
| Data1: Oxygen |
| reform (1) |
| Biography: Antoine-Laurent de Lavoisier |
| reformatsky (1) |
| On This Day... 1 April |
| reforming (2) |
| Data1: Palladium |
| Production: Hydrogen |
| refracting (1) |
| Data1: Tantalum |
| refraction (3) |
| Compounds: Tantalum |
| On This Day... 14 September |
| On This Day... 23 June |
| refractories (2) |
| Compounds: Zirconium |
| Glossary: Refractory |
| refractory (9) |
| Compounds: Chromium |
| Compounds: Niobium |
| Compounds: Tantalum |
| Compounds: Titanium |
| Compounds: Vanadium |
| Compounds: Zirconium |
| Data1: Chromium |
| Data1: Rhenium |
| Glossary: Refractory |
| refrigerant (3) |
| Compounds: Barium |
| Compounds: Sulfur |
| Data1: Neon |
| refrigerants (1) |
| Compounds: Fluorine |
| refrigerating (1) |
| Data1: Neon |
| refrigeration (4) |
| Compounds: Bismuth |
| Compounds: Magnesium |
| Compounds: Tellurium |
| Data1: Fluorine |
| refrigerator (2) |
| Compounds: Sodium |
| Glossary: Magnetic Ordering |
| refrigerators (1) |
| Compounds: Sulfur |
| refueling (1) |
| Isotope: Boron |
| refuge (1) |
| Biography: Lise Meitner |
| refuse (1) |
| Data1: Lead |
| refused (2) |
| Biography: Dmitriy Ivanovich Mendeleyev |
| Data1: Magnesium |
| regard (3) |
| Biography: Michael Faraday |
| Compounds: Magnesium |
| Compounds: Phosphorus |
| regarded (10) |
| Allotrope: Selenium |
| Biography: Julius Caesar Scaliger |
| Compounds: Cobalt |
| Data1: Bismuth |
| Data1: Cerium |
| Data1: Indium |
| Data1: Iridium |
| Data1: Lutetium |
| Data1: Zirconium |
| Isotope: Bismuth |
| regarding (2) |
| Biography: Louis Jacques Thenard |
| Glossary: IUPAC |
| regardless (1) |
| Glossary: Vickers Hardness |
| regions (7) |
| Country: Outer space |
| Data1: Copper |
| Data1: Sulfur |
| Production: Mercury |
| Production: Radon |
| Production: Sulfur |
| Production: Tantalum |
| register (1) |
| Data1: Thulium |
| registered (1) |
| Data1: Carbon |
| registry (1) |
| Data1: Carbon |
| regius (1) |
| Biography: Daniel Rutherford |
| regnault (1) |
| On This Day... 21 July |
| regolith (2) |
| Isotope: Beryllium |
| Isotope: Helium |
| regular (5) |
| Allotrope: Carbon |
| Data1: Potassium |
| Glossary: Amorphous |
| Glossary: Magnetic Ordering |
| Glossary: Periodic Law |
| regularly (3) |
| Data1: Californium |
| Isotope: Californium |
| Production: Aluminium |
| regulate (1) |
| Compounds: Iodine |
| regulated (2) |
| Compounds: Chlorine |
| Compounds: Sodium |
| regulating (1) |
| Compounds: Barium |
| regulation (4) |
| Compounds: Chlorine |
| Compounds: Sodium |
| Data1: Sodium |
| Production: Technetium |
| regulations (1) |
| Data1: Lead |
| regulator (2) |
| Compounds: Sodium |
| Data1: Cadmium |
| regulators (2) |
| Data1: Boron |
| Data1: Indium |
| reheat (1) |
| Reactions: Carbon |
| reich (5) |
| Biography: Ferdinand Reich |
| Biography: Hieronymous Theodor Richter |
| Biography: Robert Wilhelm Bunsen |
| Data1: Indium |
| On This Day... 19 February |
| reichenstein (4) |
| Biography: Franz-Joseph Muller Freiherr von Reichenstein |
| Data1: Tellurium |
| On This Day... 1 July |
| On This Day... 13 April |
| reichsanstadt (1) |
| Biography: Walter Noddack |
| reichstein (1) |
| On This Day... 20 July |
| reinforcing (1) |
| Compounds: Magnesium |
| reinhardtii (1) |
| Production: Hydrogen |
| rejected (4) |
| Biography: Joseph Priestley |
| Biography: Julius Caesar Scaliger |
| Data1: Lutetium |
| Production: Zinc |
| reknowned (1) |
| Reactions: Rhodium |
| relates (1) |
| On This Day... 14 January |
| relation (1) |
| Biography: Franz-Joseph Muller Freiherr von Reichenstein |
| relations (1) |
| On This Day... 13 June |
| relativistic (3) |
| Biography: Gottfried Münzenberg |
| Biography: Peter Armbruster |
| On This Day... 8 August |
| relaxant (1) |
| Compounds: Sodium |
| relaxation (1) |
| Biography: Julius Caesar Scaliger |
| relays (2) |
| Data1: Palladium |
| Data1: Rhodium |
| releases (5) |
| Compounds: Iron |
| Country: Outer space |
| Glossary: Exothermic |
| Isotope: Plutonium |
| Isotope: Uranium |
| releasing (6) |
| Compounds: Iodine |
| Compounds: Nitrogen |
| Compounds: Zinc |
| Glossary: Electron Capture |
| Production: Aluminium |
| Production: Oxygen |
| relevant (1) |
| Glossary: Temperature |
| reliability (1) |
| Isotope: Plutonium |
| reliant (1) |
| Production: Magnesium |
| relied (1) |
| Data1: Neodymium |
| relieve (2) |
| Biography: Irene Joliot-Curie |
| Compounds: Magnesium |
| relocated (1) |
| Biography: Dmitriy Ivanovich Mendeleyev |
| rely (1) |
| Data1: Scandium |
| remain (8) |
| Biography: Irene Joliot-Curie |
| Data1: Barium |
| Equation: Boyle's Law |
| Glossary: Isotope |
| Glossary: Molecule |
| Production: Plutonium |
| Production: Scandium |
| Reactions: Helium |
| remainder (5) |
| Biography: Joseph Priestley |
| Country: United States of America |
| Data1: Chromium |
| Production: Helium |
| Production: Neptunium |
| remarkable (4) |
| Biography: Lise Meitner |
| Biography: Pierre Jules César Janssen |
| Biography: Robert Wilhelm Bunsen |
| On This Day... 27 March |
| remarkably (1) |
| Biography: Henry Cavendish |
| remarked (1) |
| Biography: Robert Wilhelm Bunsen |
| remarried (1) |
| Biography: Jöns Jacob Berzelius |
| remedies (1) |
| Data1: Zinc |
| remedy (1) |
| Data1: Sodium |
| remelting (1) |
| Country: Outer space |
| remembered (4) |
| Biography: Jöns Jacob Berzelius |
| Biography: Per Teodor Cleve |
| Biography: Robert Wilhelm Bunsen |
| Biography: Walter Noddack |
| reminded (1) |
| Data1: Vanadium |
| reminiscent (1) |
| Biography: Walter Noddack |
| remnant (1) |
| Data1: Zinc |
| remnants (2) |
| Data1: Californium |
| Data1: Zinc |
| remote (2) |
| Country: United States of America |
| Production: Uranium |
| remotely (1) |
| Production: Lanthanum |
| removal (5) |
| Compounds: Sulfur |
| Data1: Polonium |
| Data1: Samarium |
| Glossary: Alkali Metal |
| Production: Hydrogen |
| removes (1) |
| Compounds: Sodium |
| removing (8) |
| Compounds: Zinc |
| Data1: Argon |
| Data1: Cerium |
| Data1: Manganese |
| Data1: Neodymium |
| Data1: Thulium |
| Glossary: Temperature |
| Production: Zinc |
| remsen (1) |
| On This Day... 4 April |
| ren (1) |
| On This Day... 9 January |
| renaissance (1) |
| Biography: Julius Caesar Scaliger |
| renal (1) |
| Compounds: Lanthanum |
| renamed (3) |
| Biography: Charles Hatchett |
| Data1: Erbium |
| Data1: Vanadium |
| render (1) |
| Production: Ruthenium |
| rendered (4) |
| Biography: Emilio Gino Segre |
| On This Day... 15 December |
| On This Day... 27 March |
| Production: Uranium |
| rendering (1) |
| Compounds: Aluminium |
| renders (5) |
| Reactions: Germanium |
| Reactions: Hafnium |
| Reactions: Lead |
| Reactions: Titanium |
| Reactions: Zirconium |
| renij (1) |
| Names: Rhenium |
| renio (1) |
| Names: Rhenium |
| renowned (1) |
| Data1: Tantalum |
| rensen (1) |
| On This Day... 9 January |
| reo2 (1) |
| Reactions: Rhenium |
| reo3 (1) |
| Reactions: Rhenium |
| reo4 (1) |
| Reactions: Rhenium |
| reorganized (1) |
| Biography: Frederick Soddy |
| reparations (1) |
| Production: Gold |
| repeal (1) |
| Biography: Joseph Priestley |
| repeat (1) |
| Data1: Nobelium |
| repeated (4) |
| Data1: Hafnium |
| Data1: Technetium |
| Glossary: Brinell Hardness |
| On This Day... 7 February |
| repeatedly (1) |
| Data1: Silicon |
| repeating (2) |
| Glossary: Amorphous |
| Glossary: Molecule |
| repellents (1) |
| Compounds: Silicon |
| repels (1) |
| Compounds: Zinc |
| repetiteur (1) |
| Biography: Louis Jacques Thenard |
| replace (4) |
| Compounds: Aluminium |
| Compounds: Hafnium |
| Data1: Praseodymium |
| On This Day... 27 September |
| replacement (9) |
| Biography: Michael Faraday |
| Compounds: Silicon |
| Compounds: Sodium |
| Compounds: Sulfur |
| Data1: Bismuth |
| Data1: Hydrogen |
| Data1: Osmium |
| Data1: Titanium |
| Isotope: Cobalt |
| replacing (4) |
| Compounds: Potassium |
| Data1: Germanium |
| Data1: Praseodymium |
| Data1: Radium |
| replenished (1) |
| Data1: Helium |
| replicate (1) |
| Data1: Technetium |
| reply (1) |
| Biography: Michael Faraday |
| report (1) |
| Data1: Nobelium |
| reportedly (3) |
| Data1: Copper |
| Data1: Dubnium |
| Data1: Rutherfordium |
| repository (1) |
| Biography: Joseph Priestley |
| repr (1) |
| Biography: Enrico Fermi |
| represent (5) |
| Document: The Transition Metals (Groups 3 to 12) |
| Glossary: Electron Volt |
| Glossary: Periodic Table |
| Glossary: Wavefunction |
| Isotope: Hydrogen |
| representation (2) |
| Document: Understanding Electron Configuration Tables |
| Glossary: pH |
| representative (2) |
| Data1: Mercury |
| Equation: Boyle's Law |
| represented (4) |
| Biography: Louis Jacques Thenard |
| Data1: Germanium |
| Glossary: Energy Levels |
| Glossary: Oxidation State |
| representing (6) |
| Data1: Manganese |
| Document: Understanding Electron Configuration Tables |
| Glossary: Electron |
| Glossary: Neutron |
| Glossary: Positron |
| Glossary: Proton |
| represents (7) |
| Data1: Nitrogen |
| Document: Understanding Electron Configuration Tables |
| Glossary: Atomic Mass |
| Glossary: Energy Levels |
| Glossary: pH |
| Isotope: Potassium |
| Production: Aluminium |
| reprocessed (2) |
| Production: Plutonium |
| Production: Rhodium |
| reprocessing (4) |
| Isotope: Iodine |
| Isotope: Krypton |
| Production: Rhodium |
| Production: Technetium |
| reproduce (3) |
| Data1: Germanium |
| Data1: Rutherfordium |
| Data1: Ununoctium |
| reproduced (2) |
| Biography: Ferdinand Frederic Henri Moissan |
| Data1: Hydrogen |
| reproducible (2) |
| Biography: Ida Eva Tacke Noddack |
| Compounds: Zinc |
| reproducing (1) |
| On This Day... 16 August |
| reproduction (2) |
| Data1: Scandium |
| On This Day... 16 August |
| reproductive (1) |
| Data1: Arsenic |
| repulsion (1) |
| On This Day... 14 September |
| repulsive (1) |
| Glossary: van der Waals radius |
| reputable (2) |
| Data1: Ununpentium |
| Data1: Ununtrium |
| reputation (5) |
| Biography: Albert Ghiorso |
| Biography: Clemens Alexander Winkler |
| Biography: Ida Eva Tacke Noddack |
| Biography: Julius Caesar Scaliger |
| Biography: Sir Humphry Davy |
| reputed (1) |
| Production: Aluminium |
| request (1) |
| Biography: Louis Jacques Thenard |
| requires (8) |
| Data1: Germanium |
| Data1: Polonium |
| Glossary: Alkali Metal |
| Glossary: Endothermic |
| Isotope: Cobalt |
| Production: Technetium |
| Production: Zinc |
| Reactions: Titanium |
| requiring (6) |
| Country: South Africa |
| Data1: Lithium |
| Data1: Phosphorus |
| Data1: Titanium |
| Glossary: Neutrino |
| Isotope: Iridium |
| res2 (1) |
| Country: Russia |
| rescued (1) |
| Data1: Samarium |
| researched (3) |
| Compounds: Sodium |
| On This Day... 27 February |
| On This Day... 8 August |
| researches (6) |
| Biography: Bernard Courtois |
| Biography: Henry Cavendish |
| Biography: Karl Wilhelm Scheele |
| Biography: Louis Jacques Thenard |
| Biography: Morris Travers |
| On This Day... 13 August |
| researching (1) |
| On This Day... 3 December |
| resemblance (1) |
| Data1: Bismuth |
| resemble (3) |
| Document: The Lanthanoid Series |
| Glossary: Lanthanides (old name) |
| Glossary: Lanthanoids |
| resembles (5) |
| Allotrope: Phosphorus |
| Data1: Antimony |
| Data1: Europium |
| Data1: Scandium |
| Data1: Thallium |
| resembling (2) |
| Data1: Barium |
| Data1: Helium |
| reserve (5) |
| Country: United States of America |
| Data1: Osmium |
| Production: Bromine |
| Production: Germanium |
| Production: Osmium |
| reserved (2) |
| Data1: Neodymium |
| Data1: Technetium |
| reservers (1) |
| Data1: Beryllium |
| reside (1) |
| Document: Understanding Electron Configuration Tables |
| resided (1) |
| Biography: Michael Faraday |
| residents (1) |
| Data1: Neodymium |
| resides (1) |
| Data1: Neodymium |
| residual (1) |
| Data1: Rubidium |
| residue (5) |
| Compounds: Sodium |
| Data1: Iridium |
| Data1: Krypton |
| Data1: Osmium |
| Data1: Xenon |
| residues (9) |
| Country: Australia |
| Country: China |
| Country: Kazakhstan |
| Country: Russia |
| Data1: Ruthenium |
| Data1: Thallium |
| Production: Indium |
| Production: Scandium |
| Production: Xenon |
| resigned (2) |
| Biography: Dmitriy Ivanovich Mendeleyev |
| Biography: Louis Jacques Thenard |
| resin (2) |
| Allotrope: Carbon |
| On This Day... 22 March |
| resinate (1) |
| Compounds: Copper |
| resinous (1) |
| On This Day... 14 September |
| resins (1) |
| Compounds: Sulfur |
| resist (3) |
| Data1: Titanium |
| Glossary: Alloy |
| Glossary: Vickers Hardness |
| resisting (1) |
| Data1: Niobium |
| resistors (2) |
| Compounds: Tantalum |
| Data1: Tellurium |
| resists (3) |
| Data1: Fluorine |
| Data1: Tin |
| Production: Fluorine |
| resolution (1) |
| Compounds: Phosphorus |
| resolved (4) |
| Data1: Dubnium |
| Data1: Meitnerium |
| Data1: Niobium |
| Data1: Rutherfordium |
| resonance (5) |
| Data1: Gadolinium |
| Data1: Helium |
| Data1: Titanium |
| Glossary: Aromatic |
| On This Day... 28 February |
| resonant (1) |
| Data1: Xenon |
| resource (3) |
| Country: Spain |
| Data1: Copper |
| Production: Rhodium |
| respect (5) |
| Biography: Jöns Jacob Berzelius |
| Data1: Bismuth |
| Data1: Boron |
| Glossary: Alloy |
| Glossary: Non-Metals |
| respected (1) |
| Biography: Joseph Louis Gay-Lussac |
| respective (2) |
| Biography: Irene Joliot-Curie |
| Reactions: Platinum |
| respectively (8) |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Vanadium |
| Data1: Hydrogen |
| Isotope: Darmstadtium |
| Reactions: Beryllium |
| Reactions: Selenium |
| Reactions: Tungsten |
| Reactions: Uranium |
| respiration (6) |
| Biography: Antoine-Laurent de Lavoisier |
| Compounds: Sodium |
| Data1: Helium |
| Data1: Oxygen |
| Data1: Sulfur |
| Production: Oxygen |
| respiratory (6) |
| Data1: Antimony |
| Data1: Bromine |
| Data1: Chlorine |
| Data1: Copper |
| Data1: Palladium |
| Data1: Tungsten |
| respond (1) |
| Compounds: Nitrogen |
| responded (1) |
| Compounds: Arsenic |
| responds (1) |
| Glossary: Plasma |
| responsible (9) |
| Biography: Adair Crawford |
| Compounds: Chlorine |
| Compounds: Oxygen |
| Compounds: Potassium |
| Compounds: Sodium |
| Country: Outer space |
| Data1: Argon |
| Glossary: Magnetic Ordering |
| Isotope: Aluminium |
| restoration (1) |
| On This Day... 31 December |
| restorations (1) |
| Data1: Gold |
| restorative (1) |
| Data1: Gold |
| restored (1) |
| Biography: Dmitriy Ivanovich Mendeleyev |
| restoring (1) |
| Compounds: Sodium |
| restrict (1) |
| Biography: Pierre Curie |
| restricted (3) |
| Country: United States of America |
| Data1: Mercury |
| Reactions: Carbon |
| rests (1) |
| Biography: Martin Heinrich Klaproth |
| resultant (1) |
| Biography: Robert Wilhelm Bunsen |
| resumably (2) |
| Data1: Darmstadtium |
| Data1: Dubnium |
| resumed (1) |
| Biography: Jöns Jacob Berzelius |
| retain (5) |
| Data1: Iron |
| Data1: Nobelium |
| Glossary: Magnetic Ordering |
| Glossary: Molecule |
| Glossary: Refractory |
| retained (4) |
| Data1: Actinium |
| Data1: Terbium |
| Data1: Yttrium |
| Glossary: Air |
| retains (3) |
| Allotrope: Carbon |
| Compounds: Cobalt |
| Data1: Rhenium |
| retardant (7) |
| Compounds: Antimony |
| Compounds: Boron |
| Compounds: Bromine |
| Compounds: Sodium |
| Data1: Antimony |
| Data1: Bromine |
| Data1: Sodium |
| retardation (1) |
| Data1: Lead |
| retention (4) |
| Compounds: Magnesium |
| Compounds: Tin |
| Compounds: Titanium |
| Data1: Calcium |
| retired (2) |
| Biography: Gottfried Münzenberg |
| Biography: Lise Meitner |
| retirement (3) |
| Biography: Andre Louis Debierne |
| Biography: Jean Charles Galissard de Marignac |
| Biography: Robert Wilhelm Bunsen |
| retort (2) |
| Data1: Phosphorus |
| Production: Zinc |
| retorting (1) |
| On This Day... 17 November |
| retracted (1) |
| Data1: Ununoctium |
| retraction (1) |
| Data1: Ununhexium |
| retrieve (1) |
| Biography: Robert Wilhelm Bunsen |
| returning (3) |
| Biography: Otto Hahn |
| Glossary: Isometric Transition |
| Production: Thorium |
| returns (1) |
| Compounds: Sodium |
| reusable (1) |
| Isotope: Actinium |
| reuslts (1) |
| Biography: Albert Ghiorso |
| rev (2) |
| Biography: Frederick Soddy |
| Biography: Joseph Priestley |
| reveal (1) |
| Compounds: Silver |
| revealed (2) |
| Biography: Morris Travers |
| Glossary: X-Rays |
| reverend (2) |
| Country: Oceans / Seas |
| Production: Gold |
| reverse (1) |
| Glossary: pH |
| reversed (1) |
| Data1: Terbium |
| reversible (2) |
| Data1: Lanthanum |
| Production: Hydrogen |
| reversibly (1) |
| Compounds: Vanadium |
| revert (1) |
| Allotrope: Selenium |
| reverted (1) |
| Data1: Lutetium |
| review (1) |
| Data1: Ununhexium |
| reviewed (2) |
| Data1: Ununpentium |
| Data1: Ununtrium |
| revised (2) |
| Biography: Jöns Jacob Berzelius |
| Data1: Francium |
| revisions (1) |
| Biography: Jöns Jacob Berzelius |
| revolution (5) |
| Biography: Antoine-Laurent de Lavoisier |
| Biography: Joseph Louis Gay-Lussac |
| Biography: Joseph Priestley |
| Data1: Europium |
| Data1: Iron |
| revolutionary (1) |
| Biography: Antoine-Laurent de Lavoisier |
| revolutionized (1) |
| Data1: Europium |
| revolve (1) |
| Glossary: Atom |
| reward (2) |
| Biography: Joseph Louis Gay-Lussac |
| Biography: Julius Caesar Scaliger |
| rewards (1) |
| Biography: Gottfried Münzenberg |
| rf (2) |
| Data1: Rutherfordium |
| Isotope: Rutherfordium |
| rf+4 (1) |
| Data2: Rutherfordium |
| rf260 (1) |
| Data1: Rutherfordium |
| rg (2) |
| Data1: Roentgenium |
| Isotope: Roentgenium |
| rgen (1) |
| On This Day... 16 February |
| rgyi (1) |
| On This Day... 16 September |
| rh (9) |
| Atomic data: Rhodium |
| Data1: Rhodium |
| Data2: Rhodium |
| Isotope: Palladium |
| Isotope: Rhodium |
| Isotope: Ruthenium |
| Production: Rhodium |
| Reactions: Rhodium |
| Spectrum: Rhodium |
| rh+ (1) |
| Atomic data: Rhodium |
| rh+1 (1) |
| Data2: Rhodium |
| rh+2 (1) |
| Data2: Rhodium |
| rh+3 (1) |
| Data2: Rhodium |
| rh+4 (1) |
| Data2: Rhodium |
| rh+5 (1) |
| Data2: Rhodium |
| rh+6 (1) |
| Data2: Rhodium |
| rh0 (1) |
| Data2: Rhodium |
| rh2o3 (1) |
| Reactions: Rhodium |
| rh3+ (1) |
| Reactions: Rhodium |
| rhabdophane (1) |
| Production: Cerium |
| rhbr3 (1) |
| Reactions: Rhodium |
| rhcl3 (1) |
| Reactions: Rhodium |
| rhcl63 (1) |
| Reactions: Rhodium |
| rheniite (1) |
| Country: Russia |
| rhetoric (1) |
| Biography: Julius Caesar Scaliger |
| rheumatic (1) |
| Biography: Julius Caesar Scaliger |
| rheumatoid (1) |
| Compounds: Gold |
| rhf3 (1) |
| Reactions: Rhodium |
| rhf5 (1) |
| Reactions: Platinum |
| rhf6 (1) |
| Reactions: Rhodium |
| rhines (1) |
| Data1: Rhenium |
| rho2 (1) |
| Reactions: Rhodium |
| rho2+ (1) |
| Reactions: Rhodium |
| rho42 (1) |
| Reactions: Rhodium |
| rhodochrosite (2) |
| Data1: Manganese |
| Production: Manganese |
| rhodon (1) |
| Data1: Rhodium |
| rhombohedral (6) |
| Allotrope: Boron |
| Allotrope: Phosphorus |
| Allotrope: Selenium |
| Allotrope: Sulfur |
| Data2: Boron |
| Data2: Mercury |
| rhubarb (1) |
| Glossary: Acid |
| ri (1) |
| Isotope: Hydrogen |
| ribbon (2) |
| Data1: Magnesium |
| Data1: Rhenium |
| ribonuclease (1) |
| On This Day... 4 September |
| ric (1) |
| On This Day... 19 March |
| rica (1) |
| Country: Costa Rica |
| rice (4) |
| Allotrope: Carbon |
| Compounds: Sodium |
| On This Day... 20 May |
| On This Day... 21 July |
| richard (7) |
| Allotrope: Carbon |
| Biography: Antoine-Laurent de Lavoisier |
| On This Day... 13 August |
| On This Day... 23 August |
| On This Day... 3 January |
| On This Day... 6 June |
| On This Day... 7 May |
| richards (1) |
| On This Day... 31 January |
| richardson (1) |
| Data1: Helium |
| richer (4) |
| Country: United States of America |
| Data1: Europium |
| Production: Radium |
| Production: Terbium |
| richest (3) |
| Country: Australia |
| Production: Mercury |
| Production: Terbium |
| richter (6) |
| Biography: Ferdinand Reich |
| Biography: Hieronymous Theodor Richter |
| Biography: Robert Wilhelm Bunsen |
| Data1: Indium |
| On This Day... 10 March |
| On This Day... 21 November |
| riddle (1) |
| Production: Nickel |
| ridge (5) |
| Biography: Philip Hauge Abelson |
| Data1: Einsteinium |
| Data1: Plutonium |
| Data1: Promethium |
| Production: Einsteinium |
| ridiculed (1) |
| Biography: Pierre Jules César Janssen |
| riding (1) |
| Biography: Smithson Tennant |
| riebau (1) |
| Biography: Michael Faraday |
| rifle (1) |
| Compounds: Molybdenum |
| rift (1) |
| Country: Democratic Republic of Congo |
| rigging (1) |
| Data1: Titanium |
| right (7) |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Calcium |
| Data1: Nitrogen |
| Document: Understanding Electron Configuration Tables |
| Glossary: Metalloids |
| On This Day... 19 April |
| Reactions: Uranium |
| rights (2) |
| Production: Gold |
| Production: Tantalum |
| rigid (2) |
| Biography: Jöns Jacob Berzelius |
| On This Day... 3 October |
| rigidity (3) |
| Compounds: Silicon |
| Data1: Beryllium |
| Glossary: Solid |
| riken (1) |
| Isotope: Hydrogen |
| ring (7) |
| Glossary: Aliphatic |
| Glossary: Aromatic |
| Glossary: X-Rays |
| On This Day... 23 January |
| On This Day... 27 June |
| On This Day... 7 September |
| Production: Sulfur |
| rings (4) |
| Allotrope: Carbon |
| Allotrope: Sulfur |
| Biography: Joseph Priestley |
| Compounds: Tungsten |
| rinmann (1) |
| Compounds: Cobalt |
| rio (3) |
| Biography: Emilio Gino Segre |
| Data1: Vanadium |
| On This Day... 10 November |
| rionium (1) |
| Data1: Vanadium |
| ripe (1) |
| Compounds: Sodium |
| rise (7) |
| Biography: Julius Caesar Scaliger |
| Compounds: Plutonium |
| Country: Algeria |
| Country: Qatar |
| Glossary: Emission Spectrum |
| Production: Lead |
| Reactions: Plutonium |
| risen (1) |
| Production: Indium |
| rises (1) |
| Glossary: Enthalpy Change of Fusion (Heat of Fusion) |
| rising (2) |
| Glossary: Convection |
| Production: Copper |
| risk (9) |
| Compounds: Carbon |
| Data1: Argon |
| Data1: Cobalt |
| Data1: Lithium |
| Data1: Plutonium |
| Data1: Selenium |
| Glossary: Alpha Decay |
| Production: Radon |
| Reactions: Iron |
| risks (4) |
| Data1: Nitrogen |
| Data1: Radium |
| Data1: Radon |
| Production: Radon |
| ritter (1) |
| On This Day... 16 December |
| rituals (1) |
| Data1: Gold |
| river (6) |
| Data1: Osmium |
| Data1: Rhodium |
| On This Day... 18 January |
| Production: Osmium |
| Production: Rhodium |
| Production: Thulium |
| rivers (2) |
| Data1: Mercury |
| Production: Selenium |
| rm (7) |
| Data2: Molybdenum |
| Data2: Osmium |
| Data2: Rhenium |
| Data2: Rhodium |
| Data2: Ruthenium |
| Data2: Technetium |
| Data2: Tungsten |
| rms (1) |
| Equation: Root mean square (RMS) velocity of gas molecules |
| rn+ (1) |
| Atomic data: Radon |
| rn+2 (1) |
| Data2: Radon |
| rn0 (1) |
| Data2: Radon |
| rnf6 (1) |
| Reactions: Radon |
| road (3) |
| Biography: Jöns Jacob Berzelius |
| Glossary: Spontaneous Fission |
| Production: Iron |
| roadbuilding (1) |
| Compounds: Calcium |
| roads (1) |
| Production: Uranium |
| roald (1) |
| On This Day... 18 July |
| roam (1) |
| Compounds: Silver |
| roasted (2) |
| Production: Cadmium |
| Production: Zinc |
| roaster (1) |
| Production: Rhenium |
| roasting (3) |
| Data1: Arsenic |
| Production: Arsenic |
| Production: Thallium |
| robertson (1) |
| On This Day... 17 April |
| robiquet (1) |
| On This Day... 13 January |
| rocca (1) |
| Biography: Julius Caesar Scaliger |
| rockefeller (1) |
| Biography: Emilio Gino Segre |
| rockets (3) |
| Compounds: Nitrogen |
| Data1: Aluminium |
| Data1: Hydrogen |
| rod (6) |
| Data1: Indium |
| Data1: Iron |
| Data1: Lead |
| Data1: Rhenium |
| Data1: Vanadium |
| Data1: Zirconium |
| rode (1) |
| Allotrope: Carbon |
| rodenticide (2) |
| Compounds: Arsenic |
| Compounds: Copper |
| rodenticides (1) |
| Compounds: Lead |
| rodents (1) |
| Compounds: Phosphorus |
| rodij (1) |
| Names: Rhodium |
| rodio (1) |
| Names: Rhodium |
| rodium (1) |
| Names: Rhodium |
| roentgen (1) |
| Glossary: X-Rays |
| roentgenio (2) |
| Names: Darmstadtium |
| Names: Roentgenium |
| roger (1) |
| On This Day... 24 October |
| rohs (1) |
| Data1: Lead |
| roles (1) |
| Data1: Gold |
| roll (1) |
| Data1: Germanium |
| roller (1) |
| Glossary: Brinell Hardness |
| rollers (1) |
| Compounds: Silicon |
| roman (7) |
| Data1: Copper |
| Data1: Lead |
| Data1: Mercury |
| Data1: Uranium |
| Data1: Zinc |
| Glossary: Group |
| Production: Lead |
| romance (1) |
| Data1: Tin |
| romania (4) |
| Biography: Franz-Joseph Muller Freiherr von Reichenstein |
| Country: Romania |
| Country: Russia |
| Data1: Tellurium |
| romans (5) |
| Data1: Aluminium |
| Data1: Calcium |
| Data1: Copper |
| Data1: Manganese |
| Data1: Mercury |
| rome (4) |
| Biography: Emilio Gino Segre |
| Biography: Enrico Fermi |
| Biography: Sir Humphry Davy |
| Data1: Boron |
| ronald (3) |
| On This Day... 13 May |
| On This Day... 9 May |
| On This Day... 9 November |
| rontgen (2) |
| Biography: Gottfried Münzenberg |
| Data1: Roentgenium |
| rontgenium (1) |
| Names: Roentgenium |
| roofing (1) |
| Data1: Lead |
| roofs (1) |
| Compounds: Zinc |
| rooster (1) |
| Data1: Gallium |
| root (3) |
| Data1: Lead |
| Equation: Graham's Law |
| Equation: Root mean square (RMS) velocity of gas molecules |
| rooted (1) |
| Production: Uranium |
| roots (4) |
| Biography: Robert Wilhelm Bunsen |
| Compounds: Phosphorus |
| Data1: Oxygen |
| Document: The Halogens (Group 17) |
| roques (1) |
| Biography: Julius Caesar Scaliger |
| rosalind (1) |
| On This Day... 25 July |
| roscoe (4) |
| Biography: Robert Wilhelm Bunsen |
| Data1: Vanadium |
| On This Day... 16 June |
| On This Day... 7 January |
| rose (8) |
| Biography: Jöns Jacob Berzelius |
| Biography: William Hyde Wollaston |
| Country: China |
| Country: Spain |
| Data1: Erbium |
| Data1: Iodine |
| Data1: Niobium |
| Data1: Rhodium |
| roses (1) |
| Compounds: Magnesium |
| ross (1) |
| On This Day... 13 May |
| rosy (1) |
| Data1: Rhodium |
| rotate (1) |
| Biography: Sir William Crookes |
| rotating (1) |
| On This Day... 2 May |
| rotation (3) |
| Biography: William Hyde Wollaston |
| Country: Outer space |
| Glossary: Temperature |
| rotational (1) |
| Glossary: Temperature |
| rotten (1) |
| Data1: Sulfur |
| rotting (1) |
| Compounds: Sulfur |
| rouen (1) |
| Biography: Louis Nicolas Vauquelin |
| rouge (1) |
| Compounds: Iron |
| roughly (4) |
| Biography: Lise Meitner |
| Country: Outer space |
| Data1: Beryllium |
| Glossary: Air |
| roult (1) |
| On This Day... 10 April |
| round (1) |
| Data1: Beryllium |
| roundup (1) |
| Data1: Phosphorus |
| route (1) |
| Compounds: Praseodymium |
| routed (1) |
| Production: Radon |
| routes (1) |
| Production: Hydrogen |
| routine (1) |
| Data1: Lithium |
| routinely (2) |
| Isotope: Barium |
| Production: Gallium |
| rovere (1) |
| Biography: Julius Caesar Scaliger |
| rovers (1) |
| Isotope: Polonium |
| row (4) |
| Glossary: Actinides |
| Glossary: Actinoids |
| Glossary: Lanthanides (old name) |
| Glossary: Lanthanoids |
| rowland (2) |
| On This Day... 28 June |
| On This Day... 3 December |
| rows (1) |
| Document: Understanding Electron Configuration Tables |
| roy (1) |
| On This Day... 9 July |
| royalty (1) |
| Data1: Gold |
| royds (1) |
| Data1: Helium |
| rrkm (1) |
| On This Day... 21 July |
| rt (1) |
| On This Day... 14 October |
| rtg (1) |
| Isotope: Strontium |
| rtgs (1) |
| Isotope: Strontium |
| rtut (1) |
| Names: Mercury |
| ru+ (1) |
| Atomic data: Ruthenium |
| ru+1 (1) |
| Data2: Ruthenium |
| ru+2 (1) |
| Data2: Ruthenium |
| ru+3 (1) |
| Data2: Ruthenium |
| ru+4 (1) |
| Data2: Ruthenium |
| ru+5 (1) |
| Data2: Ruthenium |
| ru+6 (1) |
| Data2: Ruthenium |
| ru+7 (1) |
| Data2: Ruthenium |
| ru+8 (1) |
| Data2: Ruthenium |
| ru0 (1) |
| Data2: Ruthenium |
| ru2+ (1) |
| Reactions: Ruthenium |
| rubbed (2) |
| Biography: Sir Humphry Davy |
| Data1: Arsenic |
| rubbery (1) |
| Compounds: Silicon |
| ruben (1) |
| Isotope: Carbon |
| rubidij (1) |
| Names: Rubidium |
| rubidio (1) |
| Names: Rubidium |
| rubidus (2) |
| Biography: Robert Wilhelm Bunsen |
| Data1: Rubidium |
| rubies (3) |
| Data1: Aluminium |
| Data1: Chromium |
| Data1: Titanium |
| rubin (1) |
| On This Day... 27 August |
| ruby (4) |
| Data1: Aluminium |
| Data1: Chromium |
| Data1: Silver |
| On This Day... 11 July |
| rucl3 (1) |
| Reactions: Ruthenium |
| rucl5 (1) |
| Reactions: Ruthenium |
| rudkjobing (1) |
| Biography: Hans Christian Oersted |
| rudolph (2) |
| On This Day... 2 January |
| On This Day... 21 July |
| ruf5 (1) |
| Reactions: Platinum |
| ruf6 (1) |
| Reactions: Ruthenium |
| ruins (2) |
| Biography: Jöns Jacob Berzelius |
| Data1: Cobalt |
| rule (6) |
| Data1: Seaborgium |
| On This Day... 11 February |
| On This Day... 14 January |
| On This Day... 24 September |
| On This Day... 28 December |
| Production: Holmium |
| rules (3) |
| On This Day... 18 July |
| On This Day... 26 March |
| On This Day... 4 February |
| ruling (2) |
| Data1: Arsenic |
| Data1: Seaborgium |
| rumford (2) |
| On This Day... 20 January |
| On This Day... 26 March |
| run (2) |
| Production: Hydrogen |
| Production: Iron |
| runaway (1) |
| Data1: Sodium |
| runge (1) |
| Biography: Robert Wilhelm Bunsen |
| running (4) |
| Biography: Bernard Courtois |
| Biography: Irene Joliot-Curie |
| Compounds: Molybdenum |
| Production: Zinc |
| runoff (1) |
| Production: Selenium |
| ruo2 (1) |
| Reactions: Ruthenium |
| ruo4 (2) |
| Data1: Ruthenium |
| Reactions: Ruthenium |
| ruo42 (1) |
| Reactions: Ruthenium |
| rus (1) |
| Data1: Ruthenium |
| rush (2) |
| Country: South Africa |
| On This Day... 24 January |
| rushes (1) |
| Data1: Gold |
| russell (1) |
| Data1: Neptunium |
| russians (1) |
| Data1: Rutherfordium |
| rust (4) |
| Compounds: Iron |
| Compounds: Sulfur |
| Data1: Manganese |
| Data1: Tin |
| rusting (3) |
| Biography: Antoine-Laurent de Lavoisier |
| Data1: Zinc |
| Reactions: Iron |
| rutenij (1) |
| Names: Ruthenium |
| rutenio (1) |
| Names: Ruthenium |
| rutenium (1) |
| Names: Ruthenium |
| ruthefordij (1) |
| Names: Rutherfordium |
| ruthenia (1) |
| Data1: Ruthenium |
| rutherfordio (1) |
| Names: Rutherfordium |
| rutt (1) |
| Biography: Joseph Priestley |
| rwanda (1) |
| Country: Rwanda |
| ryoji (1) |
| On This Day... 1 June |