Iron |
| Symbol | Fe |
|---|---|
| Latin name | Ferrum |
| Atomic number | 26 |
| Period | 4 |
| Element category | Transition elements |
| Relative atomic mass | 55.847 |
| Group | VIII.B |
| Electronegativity | 1.8 |
| Oxidation numbers | 2, 3, 6 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d6 4s2 |
| Density [g/cm3] | 7.874 |
| State | Solid |
| Melting point [°C] | 1535 |
| Boiling point [°C] | 2750 |
| Atomic radius [pm] | 156 |
| Covalent radius [pm] | 125 |
| Thermal conductivity [W m-1K-1] | 80.2 |
| Heat capacity [J K-1g-1] | 0.449 |
| Hardness [Mohs scale] | 4.0 |
| Vickers hardness [MPa] | 608 |
| Brinell hardness [MPa] | 490 |
| Young's modulus [GPa] | 211 |
| Electrical conductivity [S m-1] | 1 · 107 |
| Electrical resistivity [10-6Ω.m] | 0.101 |
| Shear modulus [GPa] | 82 |
| 1.st ionization energy [eV] | 7.9024 |
| 2.nd ionization energy [eV] | 16.18 |
| 3.rd ionization energy [eV] | 30.651 |
| Stable isotopes | 4 |
| Unstable isotopes | 6 |