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Roentgenium (Rg)
Atomic number 111 · transition
| Atomic number | 111 |
|---|---|
| Atomic mass | 281.0 u |
| Molar mass | 281.0 g/mol |
| Category | transition |
| Group / period / block | 11 / 7 / d |
| Electron configuration | [Rn] 5f14 6d10 7s1 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 1 |
| Density | 28.7 g/cm³ |
Uses
Research only — synthetic, made a few atoms at a time
Discovery
1994, Heavy Ion Research Laboratory (HIRL)