Cobalt vs Krypton
| Property | Co Cobalt | Kr Krypton |
|---|---|---|
| Atomic number | 27 | 36 |
| Symbol | Co | Kr |
| Name | Cobalt | Krypton |
| Category | transition-metal | noble-gas |
| Standard Atomic Weight | 58.933194 u | 83.798 u |
| Period | 4 | 4 |
| Group | 9 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ar]4s23d7 | [Ar]4s23d104p6 |
| Oxidation states | [-3, -1, 0, 1, 2, 3, 4, 5] | [0, 1, 2] |
| Electronegativity (Pauling) | 1.88 | 3 |
| Electron affinity | 0.661 eV | -1 eV |
| Density | 8860 kg/m³ | 3.733 kg/m³ |
| Melting point | 1494.85 °C | -157.36 °C |
| Boiling point | 2926.85 °C | -153.42 °C |
| Discovery year | 1735 | 1898 |