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