Cobalt vs Roentgenium
| Property | Co Cobalt | Rg Roentgenium |
|---|---|---|
| Atomic number | 27 | 111 |
| Symbol | Co | Rg |
| Name | Cobalt | Roentgenium |
| Category | transition-metal | transition-metal |
| Standard Atomic Weight | 58.933194 u | 281 u |
| Period | 4 | 7 |
| Group | 9 | 11 |
| Block | s | s |
| Phase at STP | solid | N/A |
| Electron configuration | [Ar]4s23d7 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-3, -1, 0, 1, 2, 3, 4, 5] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 1.88 | N/A |
| Electron affinity | 0.661 eV | 1.6 eV |
| Density | 8860 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | 1494.85 °C | -273.15 °C |
| Boiling point | 2926.85 °C | -273.15 °C |
| Discovery year | 1735 | 1994 |