Iodine
Electron Configuration: 2,8,18,18,7
Enthalpy of Fusion (kJ mol-1): 15.27
Enthalpy of Vaporisation (kJ mol-1): 41.67
Atomic Radii
Atomic Radius 140 pm
Bohr Radius 115 pm
Covalent Radius 133 pm
Van der Waals 198 pm
Oxidation States
Main I-1
Other I0, I+3, I+5, I+7
Ionisation Energies (kJ mol-1) show graph
M - M+ 1008.4
M+ - M2+ 1845.9
M2+ - M3+ 3200
M3+ - M4+ 4100
M4+ - M5+ 5000
M5+ - M6+ 7400
M6+ - M7+ 8700
M7+ - M8+ 16400
M8+ - M9+ 19300
M9+ - M10+ 22100
Covalent Bonds (kJ mol-1)
I-H 299
I-C 228
I-O 234
I-F 280
I-Cl 208
I-I 151
I-Si 234
I-P 184