Comparison of Roentgenium and Nihonium [S]ave
| Attribute |  Roentgenium × | Nihonium × |
|---|---|---|
| Discovered (year) | 1994 | 2004 |
| Atomic number | 111 | 113 |
| Group name | Transition metal | Post-transition metal |
| Oxidation states |
| - |
| Electron configuration | [Rn]7s²5f¹⁴6d⁹ (predicted) | [Rn]5f¹⁴6d¹⁰7s²7p¹ (predicted) |
| Atomic mass (u) | 282.169 | 286.182 |
| 1↑Standard state | Solid (expected) | Solid (expected) |
| Symbol | Rg | Nh |
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