Roentgenium (Rg) — Element 111: Properties & Data | Aladdin Scientific
Roentgenium(Rg) — Element 111
Roentgenium (Rg) is a transition metal with atomic number 111 and atomic mass 282.169. It sits in group 11 and period 7 of the periodic table and was discovered in 1994.
Key facts
| Atomic mass | 282.1690 u |
|---|---|
| Electron configuration | [Rn]7s2 5f14 6d9 (predicted) |
| Oxidation states | 5, 3, 1, -1 |
| Standard state | Solid (expected) |
| Year discovered | 1994 |
Frequently asked questions
What is the electron configuration of roentgenium?
The ground-state electron configuration of roentgenium is [Rn]7s2 5f14 6d9 (predicted).
What group and period is roentgenium in?
Roentgenium (Rg) is in group 11 and period 7 of the periodic table, classified as a transition metal.
What is the standard state of roentgenium?
Roentgenium is a solid (expected) at standard temperature and pressure.
When was roentgenium discovered?
Roentgenium was discovered in 1994.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .