Astatine vs Copernicium
| Property | At Astatine | Cn Copernicium |
|---|---|---|
| Atomic number | 85 | 112 |
| Symbol | At | Cn |
| Name | Astatine | Copernicium |
| Category | halogen | transition-metal |
| Standard Atomic Weight | 210 u | 285 u |
| Period | 6 | 7 |
| Group | 17 | 12 |
| Block | p | s |
| Phase at STP | solid | gas |
| Electron configuration | [Xe]6s24f145d106p5 | [Rn] 7s2 5f14 6d10(predicted) |
| Oxidation states | [-1, 1, 3, 5, 7] | [2, 4] |
| Electronegativity (Pauling) | 2.2 | N/A |
| Electron affinity | 2.391 eV | -0.8 eV |
| Density | 7000 kg/m³ | 1.400000e+4 kg/m³ |
| Melting point | 301.85 °C | -273.15 °C |
| Boiling point | -273.15 °C | -165.15 °C |
| Discovery year | 1940 | 1996 |