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Einsteinium  SEE PERIODIC TABLE
see article  SEE FULL ARTICLE

Atomic Number99
Atomic SymbolEs
Atomic Weight[252 amu]
GroupRare Earth (Actinide Series)
FormSolid
Melting Point860 °C (1580 °F, 1133.15 °K)
First Ionization Potential6.42 eV
Ground State Electron Configuration5f11 6s2 6p6 6f2
Oxidation States+3
Selected Radioisotopes253Es
Discovered byGhiorso and others, 1952
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