Selenium
Electron Configuration: 2,8,18,6
Enthalpy of Fusion (kJ mol-1): 5.1
Enthalpy of Vaporisation (kJ mol-1): 90
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) show graph
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