Einsteinium
Chemical element
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Einsteinium is a synthetic chemical element; it has symbol Es and atomic number 99. It is a member of the actinide series and it is the seventh transuranium element. It was named in honor of Albert Einstein.
Einsteinium was discovered as a... Wikipedia
Symbol: Es
Discoverers: Albert Ghiorso and Glenn T. Seaborg
Atomic number: 99
Electron configuration: Rn 5f11 7s2
Atomic mass: 252 u
Discovered: December 1952
Melting point: 1,580°F (860°C)