Co
Cobalt
Element 27 · Transition metal · Period 4, Group 9
Solid · Discovered 1735
Atomic Properties
| Atomic Number | 27 |
| Atomic Mass | 58.93319u |
| Electron Configuration | [Ar]4s2 3d7 |
| Electronegativity | 1.88Pauling |
| Atomic Radius | 192pm |
| Ionization Energy | 7.881eV |
| Electron Affinity | 0.661eV |
| Oxidation States | +3, +2 |
Physical Properties
| Standard State | Solid |
| Melting Point | 1768K |
| Boiling Point | 3200K |
| Density | 8.86g/cm³ |
| Group Block | Transition metal |
| Year Discovered | 1735 |