
| Group | Actinides | Melting Point | 900°C, 1652°F, 1173 K |
| Period | 7 | Boiling Point | Unknown |
| Block | f | Density (g Cm−3) | 15.1 |
| Atomic Number | 98 | Relative Atomic Mass | [251] |
| State At 20°C | Solid | Key Isotopes | 249Cf, 252Cf |
| Electron Configuration | [Rn] 5f107s2 | CAS Number | 7440-71-3 |