Roentgenium (Rg)
Roentgenium (Rg) is element 111. Atomic mass 282, configuration [Rn] 5f¹⁴ 6d¹⁰ 7s¹. Properties, isotopes, oxidation states, uses and history, with an interactive 3D atom model.
Key facts
| Atomic number | 111 |
|---|---|
| Symbol | Rg |
| Standard atomic weight | 282 |
| Group | 11 |
| Period | 7 |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s¹ |
| Valence electrons | 2 (Variable) |
| Common oxidation states | +1 |
| Common ions | No common ions |
Common uses
- Research only
Where it matters
- History of X-rays
Hazards
- Radioactive
History
| Discovered | 1994 |
|---|---|
| Discovered by | GSI Helmholtz Centre (Germany) |
| Name | Wilhelm Röntgen |