Attribute | Einsteinium × | Nobelium × |
---|---|---|
Standard state | Solid | Solid |
Electron configuration | [Rn]7s²5f¹¹ | [Rn]7s²5f¹⁴ |
Atomic mass (u) | 252.083 | 259.101 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Oxidation states |
|
|
Ionization energy (eV) | 6.42 | 6.65 |
Atomic radius (van der waals) (pm) | 245 | - |
Melting point (K) | 1133 | 1100 |
1↑Atomic number | 99 | 102 |
Group name | Actinide | Actinide |
Symbol | Es | No |
Discovered (year) | 1952 | 1957 |