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