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