| Tellurium | |
| Electrons per shell | 2,8,18,18,6 |
| Electron Configuration | [Kr] 4d10 5s2 5p4 ![]() |
| Ground state | 3P2 |
| Atomic Volume | 20.5 cm3 mol-1 |
| Electronegativity | 2.1 |
| Magnetic ordering | Non-magnetic |
| Mass magnetic susceptibility | -3.9 x 10-9 |
| Molar magnetic susceptibility | -4.98 x 10-10 |
| Speed of sound | 2610 m s-1 |
Thermal Properties |
|
| Enthalpy of Atomization | 190.4 kJ mol-1 @25°C |
| Enthalpy of Fusion | 13.5 kJ mol-1 |
| Enthalpy of Vaporisation | 104.6 kJ mol-1 |
| Heat Capacity | 25.73 J mol-1 K-1 |
| Thermal Conductivity | 1.97 - 3.38 W m-1 K-1 |
| Thermal Expansion | No data. |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Hardness |
|
| Brinell hardness | 180 MPa |
| Mohs hardness | 2.25 |
Elastic Properties |
|
| Bulk modulus | 65 GPa |
| Shear modulus | 16 GPa |
| Young's modulus | 43 GPa |
Electrical Properties |
|
| Electrical resistivity | No data. |
| Electrical conductivity | 2.0 x 10-6 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 1.1902 g Ah-1 |
| Electron Work Function | 4.95 eV |
| Valence Electron Potential (-eV) | 59 |
| Ionization Potential | |
| 9.009 | |
| 18.6 | |
| 27.96 | |
| Incompatibilities | Oxidizers, chlorine, cadmium. |
Flammability |
|
Optical Properties |
|
| Refractive Index (gas) | 1.000991 |
| Reflectivity | % |
Energy Levels |
|
| 27.4723 KeV | |
| 27.2017 KeV | |
| 30.9957 KeV | |
| 31.6947 KeV | |
| 30.9388 KeV | |
| 3.76933 KeV | |
| 3.7588 KeV | |
| 4.02958 KeV | |
| 4.3017 KeV | |
| 4.1192 KeV | |
| 4.0684 KeV | |
| 4.5709 KeV | |
| 4.8253 KeV | |
| 3.604 KeV | |
| 3.3344 KeV | |
Atomic Radii |
|
| 140 pm | |
| 123 pm | |
| 135 pm | |
| 206 pm | |
| 121 pm | |
| No data. | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| -2 | VI | 2.07 | 2.21 | P |
| 4 | III | 0.66 | 0.52 | |
| IV | 0.8 | 0.66 | ||
| VI | 1.11 | 0.97 | ||
| 6 | IV | 0.57 | 0.43 | C |
| VI | 0.7 | 0.56 | * | |
| 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 |
|
| Te+4 | |
| Te-2, Te-1, Te0, Te+2, Te+5, Te+6 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 869.2 | |
| 1795 | |
| 2698 | |
| 3610 | |
| 5668 | |
| 6822 | |
| 13200 | |
| 15800 | |
| 18500 | |
| 21200 | |
Covalent Bonds (kJ mol-1) |
|
| 240 | |
| 268 | |
| 335 | |
| 251 | |
| 235 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | (775) | (888) | 1042 | 1266 | ||
Crystal Structure |
|
| Trigonal | |
![]() |
a = 445.72 pm |
| b = 445.72 pm | |
| c = 592.9 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |