Roentgenium vs Copernicium
| Property | Rg Roentgenium | Cn Copernicium |
|---|---|---|
| Atomic number | 111 | 112 |
| Symbol | Rg | Cn |
| Name | Roentgenium | Copernicium |
| Category | transition-metal | transition-metal |
| Standard Atomic Weight | 281 u | 285 u |
| Period | 7 | 7 |
| Group | 11 | 12 |
| Block | s | s |
| Phase at STP | N/A | gas |
| Electron configuration | [Rn] 7s2 5f14 6d9(predicted) | [Rn] 7s2 5f14 6d10(predicted) |
| Oxidation states | [-1, 1, 3, 5] | [2, 4] |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | 1.6 eV | -0.8 eV |
| Density | 2.870000e+4 kg/m³ | 1.400000e+4 kg/m³ |
| Melting point | -273.15 °C | -273.15 °C |
| Boiling point | -273.15 °C | -165.15 °C |
| Discovery year | 1994 | 1996 |