Arsenic vs Roentgenium
| Property | As Arsenic | Rg Roentgenium |
|---|---|---|
| Atomic number | 33 | 111 |
| Symbol | As | Rg |
| Name | Arsenic | Roentgenium |
| Category | metalloid | transition-metal |
| Standard Atomic Weight | 74.921595 u | 281 u |
| Period | 4 | 7 |
| Group | 15 | 11 |
| Block | p | s |
| Phase at STP | solid | N/A |
| Electron configuration | [Ar]4s23d104p3 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-3, -2, -1, 0, 1, 2, 3, 4, 5] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 2.18 | N/A |
| Electron affinity | 0.81 eV | 1.6 eV |
| Density | 5776 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | 816.85 °C | -273.15 °C |
| Boiling point | 613.85 °C | -273.15 °C |
| Discovery year | 1250 | 1994 |