Attribute | Nobelium × | Fermium × |
---|---|---|
Atomic mass (u) | 259.101 | 257.09511 |
Standard state | Solid | Solid |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹⁴ | [Rn]5f¹²7s² |
Ionization energy (eV) | 6.65 | 6.5 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Melting point (K) | 1100 | 1800 |
1↓Atomic number | 102 | 100 |
Group name | Actinide | Actinide |
Discovered (year) | 1957 | 1952 |
Symbol | No | Fm |