Nickel |
| Symbol | Ni |
|---|---|
| Latin name | Niccolum |
| Atomic number | 28 |
| Period | 4 |
| Element category | Transition elements |
| Relative atomic mass | 58.69 |
| Group | VIII.B |
| Electronegativity | 1.8 |
| Oxidation numbers | 2, 3 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d8 4s2 |
| Density [g/cm3] | 8.908 |
| State | Solid |
| Melting point [°C] | 1455 |
| Boiling point [°C] | 2732 |
| Thermal conductivity [W m-1K-1] | 90.7 |
| Heat capacity [J K-1g-1] | 0.444 |
| Discovery | 1751 |
| Hardness [Mohs scale] | 4.0 |
| Vickers hardness [MPa] | 638 |
| Brinell hardness [MPa] | 700 |
| Young's modulus [GPa] | 200 |
| Electrical conductivity [S m-1] | 1.4 · 107 |
| Shear modulus [GPa] | 76 |
| 1.st ionization energy [eV] | 7.6398 |
| 2.nd ionization energy [eV] | 18.168 |
| 3.rd ionization energy [eV] | 35.17 |
| Stable isotopes | 5 |
| Unstable isotopes | 7 |