Hydrogen vs Roentgenium
| Property | H Hydrogen | Rg Roentgenium |
|---|---|---|
| Atomic number | 1 | 111 |
| Symbol | H | Rg |
| Name | Hydrogen | Roentgenium |
| Category | nonmetal | transition-metal |
| Standard Atomic Weight | 1.007975 u | 281 u |
| Period | 1 | 7 |
| Group | 1 | 11 |
| Block | s | s |
| Phase at STP | gas | N/A |
| Electron configuration | 1s1 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-1, 1] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 2.2 | N/A |
| Electron affinity | 0.75419 eV | 1.6 eV |
| Density | 0.08988 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | -259.34 °C | -273.15 °C |
| Boiling point | -252.87 °C | -273.15 °C |
| Discovery year | 1766 | 1994 |