| Beryllium | |
| Electrons per shell | 2,2 |
| Electron Configuration | 1s2 2s2 ![]() |
| Ground state | 1S0 |
| Atomic Volume | 5 cm3 mol-1 |
| Electronegativity | 1.57 |
| Magnetic ordering | Diamagnetic |
| Mass magnetic susceptibility | -1.26 x 10-8 |
| Molar magnetic susceptibility | -1.136 x 10-10 |
| Speed of sound | 12870 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 326.4 kJ mol-1 @25°C |
| Enthalpy of Fusion | 9.80 kJ mol-1 |
| Enthalpy of Vaporisation | 308.8 kJ mol-1 |
| Heat Capacity | 16.443 J mol-1 K-1 |
| Thermal Conductivity | 200 W m-1 K-1 |
| Thermal Expansion | 11.3 μm m-1 K-1 |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 600 MPa |
| Mohs hardness | 5.5 |
| Vickers hardness | 1670 MPa |
Elastic Properties |
|
| Bulk modulus | 130 GPa |
| Poisson ratio | 0.032 |
| Shear modulus | 132 GPa |
| Young's modulus | 287 GPa |
Electrical Properties |
|
| Electrical resistivity | 4 x 10-8 Ω m |
| Electrical conductivity | 0.313 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 0.16812 g Ah-1 |
| Electron Work Function | 4.98 eV |
| Valence Electron Potential (-eV) | 82 |
| Ionization Potential | |
| 9.322 | |
| 18.211 | |
| 153.893 | |
| Incompatibilities | Acids and strong bases, carbon tetrachloride (CCl4), phos- phorous 3-chlorolithium, caustics, chlorinated hydrocarbons, oxidizers, molten lithium. |
Flammability |
|
Energy Levels |
|
| 0.1085 KeV | |
Atomic Radii |
|
| 105 pm | |
| 112 pm | |
| 90 pm | |
| No data. | |
| 85 pm | |
| 112 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 2 | III | 0.3 | 0.16 | |
| IV | 0.41 | 0.27 | * | |
| VI | 0.59 | 0.45 | C | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
Oxidation States |
|
| Be+2 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 899.4 | |
| 1757.1 | |
| 14848 | |
| 21006 | |
Covalent Bonds (kJ mol-1) |
|
| 226 | |
| 523 | |
| 615 | |
| 293 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 1462 | 1608 | 1791 | 2023 | 2327 | 2742 |
Crystal Structure |
|
| Hexagonal close packed | |
![]() |
a = 228.58 pm |
| b = 228.58 pm | |
| c = 358.43 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |