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Meitnerium (Mt)
Atomic number 109 · transition
| Atomic number | 109 |
|---|---|
| Atomic mass | 276.0 u |
| Molar mass | 276.0 g/mol |
| Category | transition |
| Group / period / block | 9 / 7 / d |
| Electron configuration | [Rn] 5f14 6d7 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 15, 2 |
| Density | 37.4 g/cm³ |
Uses
Research only — synthetic, made a few atoms at a time
Discovery
1982, Heavy Ion Research Laboratory (HIRL)