Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Selenium | |
| Electron Configuration | 2,8,18,6 |
| Electron Configuration | [Ar] 3d10 4s2 4p4 |
| Electronegativity | 2.55 |
| Enthalpy of Fusion | 5.1 kJ mol-1 |
| Enthalpy of Vaporisation | 90 kJ mol-1 |
| Heat Capacity | 25.363 J mol-1 K-1 |
| Thermal Conductivity | 0.519 W m-1 K-1 |
| Thermal Expansion | 37 μm m-1 K-1 |
| Magnetic ordering | No data |
| Speed of sound | 3350 m s-1 |
| Young's modulus | 10 GPa |
| Shear modulus | 3350 GPa |
| Bulk modulus | 8.3 GPa |
| Poisson ratio | 0.33 |
| Mohs hardness | 2.0 |
| Brinell hardness | 736 MPa |
| Atomic Radii |
|
| Atomic Radius
|
115 pm |
| Bohr Radius
|
103 pm |
| Covalent Radius
|
116 pm |
| Van der Waals
|
190 pm |
| Oxidation States |
|
| Main
|
Se+4, Se+6 |
| Other
|
Se-2, Se+1, Se+2 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
940.9 |
| M+ - M2+ |
2044 |
| M2+ - M3+ |
2974 |
| M3+ - M4+ |
4144 |
| M4+ - M5+ |
6590 |
| M5+ - M6+ |
7883 |
| M6+ - M7+ |
14990 |
| M7+ - M8+ |
19500 |
| M8+ - M9+ |
23300 |
| M9+ - M10+ |
27200 |
| Covalent Bonds (kJ mol-1) |
|
| Se-H
|
305 |
| Se-C
|
245 |
| Se-O
|
343 |
| Se-F
|
285 |
| Se-Cl
|
245 |
| Se-Se
|
330 |