Attribute | Lawrencium × | Berkelium × |
---|---|---|
Atomic mass (u) | 266.12 | 247.07031 |
Standard state | Solid | Solid |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹⁴6d¹ | [Rn]7s²5f⁹ |
1↑Atomic radius (van der waals) (pm) | - | 244 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Melting point (K) | 1900 | 1323 |
Ionization energy (eV) | - | 6.23 |
Density (g/cm³) | - | 14 |
Atomic number | 103 | 97 |
Symbol | Lr | Bk |
Discovered (year) | 1961 | 1949 |
Group name | Actinide | Actinide |