Es
Einsteinium
Element 99 · Actinide · Period 7, Group 13
Solid · Discovered 1952
Atomic Properties
| Atomic Number | 99 |
| Atomic Mass | 252.083u |
| Electron Configuration | [Rn]7s2 5f11 |
| Electronegativity | 1.3Pauling |
| Atomic Radius | 245pm |
| Ionization Energy | 6.42eV |
| Oxidation States | +3 |
Physical Properties
| Standard State | Solid |
| Melting Point | 1133K |
| Group Block | Actinide |
| Year Discovered | 1952 |