Neon vs Roentgenium
| Property | Ne Neon | Rg Roentgenium |
|---|---|---|
| Atomic number | 10 | 111 |
| Symbol | Ne | Rg |
| Name | Neon | Roentgenium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 20.1797 u | 281 u |
| Period | 2 | 7 |
| Group | 18 | 11 |
| Block | p | s |
| Phase at STP | gas | N/A |
| Electron configuration | [He]2s22p6 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [0] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | -1.2 eV | 1.6 eV |
| Density | 0.8999 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | -248.59 °C | -273.15 °C |
| Boiling point | -246.05 °C | -273.15 °C |
| Discovery year | 1898 | 1994 |