Comparison of Roentgenium and Copernicium [S]ave
| Attribute |  Copernicium × | Roentgenium × |
|---|---|---|
| Discovered (year) | 1996 | 1994 |
| Atomic number | 112 | 111 |
| Group name | Transition metal | Transition metal |
| Oxidation states |
|
|
| Electron configuration | [Rn]7s²5f¹⁴6d¹⁰ (predicted) | [Rn]7s²5f¹⁴6d⁹ (predicted) |
| Atomic mass (u) | 286.179 | 282.169 |
| Standard state | Solid (expected) | Solid (expected) |
| Symbol | Cn | Rg |
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