Attribute | Lawrencium × | Fermium × |
---|---|---|
Atomic mass (u) | 266.12 | 257.09511 |
Standard state | Solid | Solid |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹⁴6d¹ | [Rn]5f¹²7s² |
Ionization energy (eV) | - | 6.5 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Melting point (K) | 1900 | 1800 |
Atomic number | 103 | 100 |
Group name | Actinide | Actinide |
Symbol | Lr | Fm |
Discovered (year) | 1961 | 1952 |