Rg
Roentgenium
Element 111 · 282.169 u
Unknown Properties
d-block
Period 7
Group 11
Unknown at RT
Radioactive
t½ 100 seconds
Synthetic
Wikipedia →
Roentgenium may be the most electronegative metal due to relativistic effects.
Physical Properties
| Atomic Mass | 282.169 u |
| Density | 28.7 g/cm³ |
| Appearance | Metallic (predicted) |
| State at Room Temp | Unknown |
Chemical Properties
| Oxidation States | +1, +3, +5 |
Atomic Properties
| Electron Configuration | [Rn] 5f14 6d9 7s2 |
Discovery
| Discovered By | Peter Armbruster, Gottfried Munzenberg and others |
| Discovery Year | 1994 |
| Location | Darmstadt, Germany |
| Named After | Named after Wilhelm Conrad Rontgen, discoverer of X-rays |
About Roentgenium
Roentgenium is a synthetic, extremely radioactive element expected to be similar to gold. Relativistic effects significantly influence its predicted properties.
Uses & Applications
No practical applications. Scientific research only.
Fun Fact
Roentgenium is predicted to be the most electronegative metal due to relativistic effects on its electron orbitals.
Isotopes
| Mass Number | Abundance | Half-Life | Stable |
| 280 | - | 3.6 seconds | No |
| 282 | - | 100 seconds | No |
Electron Configuration
[Rn] 5f14 6d9 7s2