| Einsteinium | ≡ |
| Symbol | Es |
|---|---|
| Latin name | Einsteinium |
| Atomic number | 99 |
| Period | 7 |
| Element category | Inner transition elements |
| Relative atomic mass | 252.0829 |
| Group | III.B |
| Oxidation numbers | 2, 3 |
| State | Solid |
| Melting point [°C] | 850 |
| Thermal conductivity [W m-1K-1] | 10 |
| Discovery | 1954 |
| 1.st ionization energy [eV] | 6.42 |
| Stable isotopes | 0 |
| Unstable isotopes | 12 |