Roentgenium
Roentgenium (𬬭, symbol Rg) is chemical element number 111, an Unknown in period 7, group 11 of the periodic table, with a standard atomic weight of about 282. Named after Wilhelm Conrad Röntgen, discoverer of X-rays.
Properties
| Atomic number | 111 |
|---|---|
| Symbol | Rg |
| Atomic mass | 282 u |
| Category | Unknown |
| Period | 7 |
| Group | 11 |
| Electron configuration | [Rn] 5f¹⁴ 6d⁹ 7s² |
| Electronegativity | — |
| Covalent radius | — |
| Density | 28.7 g/cm³ |
| Melting point | — |
| Boiling point | — |
| Discovery | GSI, 1994 |
Overview
Named after Wilhelm Conrad Röntgen, discoverer of X-rays. Roentgenium (Rg) holds position 111 in the periodic table, an Unknown in period 7, group 11. Most of its properties still await further experimental confirmation.
It has the configuration [Rn] 5f¹⁴ 6d⁹ 7s²; its 2 outer-shell electrons drive its bonding. Its physical state follows from its melting and boiling points; it has a density around 28.7 g/cm³.
It is widely used in Research. On the safety side, it carries a high hazard rating. It was first described by GSI in 1994.
Electron shells
Electrons per shell: 2 · 8 · 18 · 32 · 32 · 17 · 2
Main uses
- Research
Hazard
Compounds containing Roentgenium
No compounds in this knowledge base contain Roentgenium yet.
Data sources
Atomic mass uses IUPAC (CIAAW) standard atomic weights; the covalent radius is from Cordero et al. (2008). Verify on the RSC Periodic Table, PubChem and Wikipedia. Educational reference only.