Chromium |
| Symbol | Cr |
|---|---|
| Latin name | Chromium |
| Atomic number | 24 |
| Period | 4 |
| Element category | Transition elements |
| Relative atomic mass | 51.9961 |
| Group | VI.B |
| Electronegativity | 1.6 |
| Oxidation numbers | 2, 3, 4, 5, 6 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d5 4s1 |
| Density [g/cm3] | 7.19 |
| State | Solid |
| Melting point [°C] | 1857 |
| Boiling point [°C] | 2672 |
| Atomic radius [pm] | 166 |
| Covalent radius [pm] | 127 |
| Thermal conductivity [W m-1K-1] | 93.7 |
| Heat capacity [J K-1g-1] | 0.449 |
| Discovery | 1797 |
| Hardness [Mohs scale] | 9.0 |
| Vickers hardness [MPa] | 1060 |
| Brinell hardness [MPa] | 1120 |
| Young's modulus [GPa] | 279 |
| Electrical conductivity [S m-1] | 7.9 · 106 |
| Shear modulus [GPa] | 115 |
| 1.st ionization energy [eV] | 6.7666 |
| 2.nd ionization energy [eV] | 16.5 |
| 3.rd ionization energy [eV] | 30.96 |
| Stable isotopes | 4 |
| Unstable isotopes | 5 |