99
Einsteinium
Atomic Number99
Atomic Mass252 u
CategoryActinide
State at Room TempSolid
Year Discovered1952
About Einsteinium
Discovered in the radioactive debris of the first hydrogen bomb test and named after Albert Einstein. So radioactive that it destroys its own crystal structure and its compounds glow visible purple. Made in specialized reactors atom by atom. Its longest lived isotope survives 471 days. Purely a research element with no practical uses.
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