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This is Einsteinium.

Symbol Es
Atomic number 99
Atomic mass (254) amu

Einsteinium, discovered in 1952, was named after Albert Einstein. It was first detected from the debris of a hydrogen bomb explosion at Eniwetok in the Pacific. Tons of radioactive coral in the blast area were sifted and examined. Einsteinium was later used in nuclear reactors.

See also

Periodic table of the elements