Oxygen vs Roentgenium
| Property | O Oxygen | Rg Roentgenium |
|---|---|---|
| Atomic number | 8 | 111 |
| Symbol | O | Rg |
| Name | Oxygen | Roentgenium |
| Category | nonmetal | transition-metal |
| Standard Atomic Weight | 15.9994 u | 281 u |
| Period | 2 | 7 |
| Group | 16 | 11 |
| Block | p | s |
| Phase at STP | gas | N/A |
| Electron configuration | [He]2s22p4 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-2, -1, 0, 1, 2] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 3.44 | N/A |
| Electron affinity | 1.4611 eV | 1.6 eV |
| Density | 1.429 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | -218.79 °C | -273.15 °C |
| Boiling point | -182.95 °C | -273.15 °C |
| Discovery year | 1771 | 1994 |