Cobalt vs Nobelium
| Property | Co Cobalt | No Nobelium |
|---|---|---|
| Atomic number | 27 | 102 |
| Symbol | Co | No |
| Name | Cobalt | Nobelium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 58.933194 u | 259 u |
| Period | 4 | 7 |
| Group | 9 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d7 | [Rn]7s25f14 |
| Oxidation states | [-3, -1, 0, 1, 2, 3, 4, 5] | [2, 3] |
| Electronegativity (Pauling) | 1.88 | 1.3 |
| Electron affinity | 0.661 eV | -2.36 eV |
| Density | 8860 kg/m³ | 9900 kg/m³ |
| Melting point | 1494.85 °C | 826.85 °C |
| Boiling point | 2926.85 °C | -273.15 °C |
| Discovery year | 1735 | 1957 |