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Dubnium (Db)
Atomic number 105 · transition
| Atomic number | 105 |
|---|---|
| Atomic mass | 268.0 u |
| Molar mass | 268.0 g/mol |
| Category | transition |
| Group / period / block | 5 / 7 / d |
| Electron configuration | [Rn] 5f14 6d3 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 11, 2 |
| Density | 29.3 g/cm³ |
| First ionisation energy | 6.8 eV |
Uses
Research only — synthetic, made a few atoms at a time
Discovery
1970, A. Ghiorso, et al