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Rutherfordium (Rf)
Atomic number 104 · transition
| Atomic number | 104 |
|---|---|
| Atomic mass | 267.0 u |
| Molar mass | 267.0 g/mol |
| Category | transition |
| Group / period / block | 4 / 7 / d |
| Electron configuration | [Rn] 5f14 6d2 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |
| Density | 23.3 g/cm³ |
| First ionisation energy | 6.02 eV |
| Common oxidation states | +4 |
Uses
Research only — synthetic, made a few atoms at a time
Discovery
1969, A. Ghiorso, et al