- Atomic Mass: 126.90447
- Electronegativity:
- Pauling: 2.66
- Allred: 2.21
- Absolute: 6.76 eV
- Electron Affinity: 269.2 kJ mol-1
- Polarizability: 5 Å3
- Effective Nuclear Charge:
- Slater: 7.6
- Clementi: 11.61
- Froese Fischer: 14.59
- Radius:
- I 1 -: 220 pm
- Covalent: 133.3 pm
- Van der Waals: 215 pm
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- Successive Ionization Energies:
- I -› I + : 1008.4 kJ mol-1
- I+1 -› I+2 : 1845.9 kJ mol-1
- I+2 -› I+3 : 3200 kJ mol-1
- I+3 -› I+4 : (4100) kJ mol-1
- I+4 -› I+5 : (5000) kJ mol-1
- I+5 -› I+6 : (7400) kJ mol-1
- I+6 -› I+7 : (8700) kJ mol-1
- I+7 -› I+8 : (16400) kJ mol-1
- I+8 -› I+9 : (19300) kJ mol-1
- I+9 -› I+10 : (22100) kJ mol-1
- Common Ions : I 1 -
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