Cobalt
Transition metal| Atomic number | 27 |
|---|---|
| Category | Transition metal |
| Atomic mass | 58.933 |
| Electron configuration | [Ar]3d⁷ 4s² |
| Oxidation states | +2, +3 |
| Electronegativity | 1.88 |
| Melting point | 1,495 °C |
| Boiling point | 2,927 °C |
| Density | 8.9 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Group | 9 |
| Period | 4 |
| Block | d |
| Discovered | 1,735 |
| Crustal abundance | 25 ppm |
