| Property | Value |
|---|---|
| Atomic number | 27 |
| Atomic weight | 58.9331955 amu |
| Element family | Transition metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 59Co: 100% |
| Previous element | Iron |
| Next element | Nickel |
| Density | 8.86 g/cm3 (STP) |
| Melting | 1495 °C |
| Boiling | 2870 °C |
| Covalent radius | 1.11 Å |
| Ionic radius | 0.745 Å |
| Metallic radius | 1.25 Å |
| First ionization potential | 7.881 eV |
| Electron affinity | 0.662 eV |
| Electronegativity | 1.88 |
| Discovery year | 1735 |
Cobalt is an element number 27 from transition metals family. Its symbol is Co. Cobalt atomic weight is 58.9331955 amu. Co stable and long lived isotopes are 59Co: 100%. Cobalt electronic configuration is 1s22s22p63s23p64s23d7. Sample compounds that contain Cobalt are CoCl2, Co2, Co(NO3)2, [Co(NH3)5Cl]Cl2, CaCo3, Co3N2.
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