| Property | Value |
|---|---|
| Atomic number | 99 |
| Atomic weight | 252.0829 amu |
| Element family | Actinoids |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Californium |
| Next element | Fermium |
| Density | 13.5 g/cm3 (STP) |
| Melting | 860 °C |
| Boiling | 996 °C |
| Ionic radius | 0.925 Å |
| Metallic radius | 1.86 Å |
| First ionization potential | 6.415 eV |
| Electron affinity | -0.300 eV |
| Electronegativity | 1.3 |
| Discovery year | 1952 |
Einsteinium is an element number 99 from actinoids family. Its symbol is Es. Einsteinium atomic weight is 252.0829 amu. Es has no stable or long lived isotopes. Einsteinium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s25f11. Einsteinium density is 13.5 g/cm3 (STP). Einsteinium melting point is 860 °C. Einsteinium boiling point is 996 °C. Einsteinium ionic radius is 0.925 Å. Einsteinium covalent radius is 1.86 Å. Einsteinium first ionization potential is 6.415 eV. Einsteinium first ionization potential is -0.300 eV. Einsteinium electronegativity by Pauling scale is 1.3. Einsteinium was discovered in 1952.
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