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Einsteinium
SEE PERIODIC TABLE
SEE FULL ARTICLE
Atomic Number
99
Atomic
Symbol
Es
Atomic Weight
[252 amu]
Group
Rare Earth (Actinide Series)
Form
Solid
Melting Point
860 °C (1580 °F, 1133.15 °K)
First
Ionization Potential
6.42 eV
Ground State
Electron Configuration
5f
11
6s
2
6p
6
6f
2
Oxidation State(s)
+3
Selected
Radioisotopes
253
Es
Discovered by
Ghiorso and others, 1952
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