Quick Facts
| Property | Value |
|---|---|
| Symbol | Rg |
| Atomic Number | 111 |
| Atomic Mass | [282] u |
| Category | Transition Metal |
| Period | 7 |
| Group | 11 |
| Block | d |
| Electron Configuration | [Rn] 5f¹⁴ 6d⁹ 7s² |
History and Discovery
Discovered by: Sigurd Hofmann and colleagues Year of Discovery: 1994 Location: GSI, Darmstadt, Germany
Etymology
Named after Wilhelm Röntgen, discoverer of X-rays.
Interesting Facts
- Named after Wilhelm Röntgen (X-ray discoverer)
- Predicted to resemble gold
- Most stable isotope has about 2.1-minute half-life
- Only a few atoms have been produced
- Properties are theoretical predictions