Cobalt vs Astatine
| Property | Co Cobalt | At Astatine |
|---|---|---|
| Atomic number | 27 | 85 |
| Symbol | Co | At |
| Name | Cobalt | Astatine |
| Category | transition-metal | halogen |
| Standard Atomic Weight | 58.933194 u | 210 u |
| Period | 4 | 6 |
| Group | 9 | 17 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Ar]4s23d7 | [Xe]6s24f145d106p5 |
| Oxidation states | [-3, -1, 0, 1, 2, 3, 4, 5] | [-1, 1, 3, 5, 7] |
| Electronegativity (Pauling) | 1.88 | 2.2 |
| Electron affinity | 0.661 eV | 2.391 eV |
| Density | 8860 kg/m³ | 7000 kg/m³ |
| Melting point | 1494.85 °C | 301.85 °C |
| Boiling point | 2926.85 °C | -273.15 °C |
| Discovery year | 1735 | 1940 |