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Californium (Cf)
Atomic number 98 · Actinide
| Atomic number | 98 |
|---|---|
| Atomic mass | 251.0 u |
| Molar mass | 251.0 g/mol |
| Category | Actinide |
| Group / period / block | — / 7 / f |
| Electron configuration | [Rn] 5f10 7s2 |
| Electrons per shell | 2, 8, 18, 32, 28, 8, 2 |
| Density | 15.1 g/cm³ |
| First ionisation energy | 6.2819 eV |
| Melting point | 1173.15 K (900.00 °C) |
| Common oxidation states | +3 |
Uses
Neutron source for reactor start-up, metal detection
Discovery
1950, G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr