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