Potassium vs Cobalt
| Property | K Potassium | Co Cobalt |
|---|---|---|
| Atomic number | 19 | 27 |
| Symbol | K | Co |
| Name | Potassium | Cobalt |
| Category | alkali-metal | transition-metal |
| Standard Atomic Weight | 39.0983 u | 58.933194 u |
| Period | 4 | 4 |
| Group | 1 | 9 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s1 | [Ar]4s23d7 |
| Oxidation states | [-1, 1] | [-3, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 0.82 | 1.88 |
| Electron affinity | 0.5014 eV | 0.661 eV |
| Density | 890 kg/m³ | 8860 kg/m³ |
| Melting point | 63.38 °C | 1494.85 °C |
| Boiling point | 758.85 °C | 2926.85 °C |
| Discovery year | 1807 | 1735 |