Attribute | Mendelevium × | Einsteinium × |
---|---|---|
Standard state | Solid | Solid |
Electron configuration | [Rn]7s²5f¹³ | [Rn]7s²5f¹¹ |
1↓Atomic mass (u) | 258.09843 | 252.083 |
Electronegativity (pauling scale) | 1.3 | 1.3 |
Oxidation states |
|
|
Ionization energy (eV) | 6.58 | 6.42 |
Atomic radius (van der waals) (pm) | - | 245 |
Melting point (K) | 1100 | 1133 |
Atomic number | 101 | 99 |
Group name | Actinide | Actinide |
Symbol | Md | Es |
Discovered (year) | 1955 | 1952 |