Chromium vs Roentgenium
| Property | Cr Chromium | Rg Roentgenium |
|---|---|---|
| Atomic number | 24 | 111 |
| Symbol | Cr | Rg |
| Name | Chromium | Roentgenium |
| Category | transition-metal | transition-metal |
| Standard Atomic Weight | 51.9961 u | 281 u |
| Period | 4 | 7 |
| Group | 6 | 11 |
| Block | s | s |
| Phase at STP | solid | N/A |
| Electron configuration | [Ar]3d54s1 | [Rn] 7s2 5f14 6d9(predicted) |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4, 5, 6] | [-1, 1, 3, 5] |
| Electronegativity (Pauling) | 1.66 | N/A |
| Electron affinity | 0.675 eV | 1.6 eV |
| Density | 7150 kg/m³ | 2.870000e+4 kg/m³ |
| Melting point | 1906.85 °C | -273.15 °C |
| Boiling point | 2670.85 °C | -273.15 °C |
| Discovery year | 1797 | 1994 |