Attribute | Californium × | Fermium × |
---|---|---|
Standard state | Solid | Solid |
Electron configuration | [Rn]7s²5f¹⁰ | [Rn]5f¹²7s² |
Atomic mass (u) | 251.07959 | 257.09511 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
1↓Oxidation states |
|
|
Ionization energy (eV) | 6.3 | 6.5 |
Atomic radius (van der waals) (pm) | 245 | - |
Melting point (K) | 1173 | 1800 |
Atomic number | 98 | 100 |
Group name | Actinide | Actinide |
Symbol | Cf | Fm |
Discovered (year) | 1950 | 1952 |