Boron vs Roentgenium
| Property | B Boron | Rg Roentgenium |
|---|---|---|
| Atomic number | 5 | 111 |
| Symbol | B | Rg |
| Name | Boron | Roentgenium |
| Category | metalloid | transition-metal |
| Standard Atomic Weight | 10.8135 u | 281 u |
| Period | 2 | 7 |
| Group | 13 | 11 |
| Block | p | s |
| Phase at STP | solid | N/A |
| Electron configuration | [He]2s22p1 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 2.04 | N/A |
| Electron affinity | 0.27972 eV | 1.6 eV |
| Density | 2370 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | 2074.85 °C | -273.15 °C |
| Boiling point | 3999.85 °C | -273.15 °C |
| Discovery year | 1808 | 1994 |