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Einsteinium


99

Es

Einsteinium
252.00000
2
8
18
32
8
2
2
11

Source

Einsteinium is a synthetic element with symbol Es and atomic number 99. It is the seventh transuranic element, and an actinide. Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein.