Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Iron | |
| Electron Configuration | 2,8,14,2 |
| Electron Configuration | [Ar] 3d6 4s2 |
| Electronegativity | 1.83 |
| Enthalpy of Fusion | 14.9 kJ mol-1 |
| Enthalpy of Vaporisation | 340.2 kJ mol-1 |
| Heat Capacity | 25.10 J mol-1 K-1 |
| Thermal Conductivity | 80.4 W m-1 K-1 |
| Thermal Expansion | 11.8 μm m-1 K-1 |
| Magnetic ordering | Ferromagnetic |
| Electrical resistivity | 96.1 Ω m |
| Speed of sound | 5120 m s-1 |
| Young's modulus | 211 GPa |
| Shear modulus | 5120 GPa |
| Bulk modulus | 170 GPa |
| Poisson ratio | 0.29 |
| Mohs hardness | 4.0 |
| Vickers hardness | 608 MPa |
| Brinell hardness | 490 MPa |
| Atomic Radii |
|
| Atomic Radius
|
140 pm |
| Bohr Radius
|
156 pm |
| Covalent Radius
|
125 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Fe+2, Fe+3 |
| Other
|
Fe-2, Fe-1, Fe0, Fe+1, Fe+4, Fe+5, Fe+6 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
759.3 |
| M+ - M2+ |
1561 |
| M2+ - M3+ |
2957 |
| M3+ - M4+ |
5290 |
| M4+ - M5+ |
7240 |
| M5+ - M6+ |
9600 |
| M6+ - M7+ |
12100 |
| M7+ - M8+ |
14575 |
| M8+ - M9+ |
22678 |
| M9+ - M10+ |
25290 |