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Cobalt (Co)
Atomic number 27 · transition
| Atomic number | 27 |
|---|---|
| Atomic mass | 58.93319 u |
| Molar mass | 58.93319 g/mol |
| Category | transition |
| Group / period / block | 9 / 4 / d |
| Electron configuration | [Ar] 3d7 4s2 |
| Electrons per shell | 2, 8, 15, 2 |
| Electronegativity (Pauling) | 1.88 |
| Atomic radius | 135.0 pm |
| Density | 8.86 g/cm³ |
| First ionisation energy | 7.881 eV |
| Melting point | 1768.15 K (1495.00 °C) |
| Boiling point | 3200.15 K (2927.00 °C) |
| Common oxidation states | +2, +3 |
| Abundance in Earth's crust | 25 ppm |
Uses
Batteries, blue pigment, magnets
Discovery
1739, George Brandt