- Atomic Mass: 55.847
- Electronegativity:
- Pauling: 1.83
- Allred: 1.64
- Absolute: 4.06 eV
- Electron Affinity: 15.7 kJ mol-1
- Polarizability: 8.4 Å3
- Effective Nuclear Charge:
- Slater: 3.75
- Clementi: 5.43
- Froese Fischer: 7.4
- Radius:
- Fe 2 +: 82 pm
- Fe 3 +: 67 pm
- Atomic: 124.1 pm
- Covalent: 116.5 pm
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- Successive Ionization Energies:
- Fe -› Fe + : 759.3 kJ mol-1
- Fe+1 -› Fe+2 : 1561 kJ mol-1
- Fe+2 -› Fe+3 : 2957 kJ mol-1
- Fe+3 -› Fe+4 : 5290 kJ mol-1
- Fe+4 -› Fe+5 : 7240 kJ mol-1
- Fe+5 -› Fe+6 : 9600 kJ mol-1
- Fe+6 -› Fe+7 : 12100 kJ mol-1
- Fe+7 -› Fe+8 : 14575 kJ mol-1
- Fe+8 -› Fe+9 : 22678 kJ mol-1
- Fe+9 -› Fe+10 : 25290 kJ mol-1
- Common Ions : Fe 2 +, Fe 3 +
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