Attribute | Einsteinium × | Berkelium × |
---|---|---|
Atomic mass (u) | 252.083 | 247.07031 |
Standard state | Solid | Solid |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹¹ | [Rn]7s²5f⁹ |
1↓Atomic radius (van der waals) (pm) | 245 | 244 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Melting point (K) | 1133 | 1323 |
Ionization energy (eV) | 6.42 | 6.23 |
Density (g/cm³) | - | 14 |
Atomic number | 99 | 97 |
Group name | Actinide | Actinide |
Symbol | Es | Bk |
Discovered (year) | 1952 | 1949 |