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     99    

99 Es Einsteinium

Actinoid, mass: 252 u, no stable and no natural isotopes.

300 micrograms of Einsteinium 253, which has a half-life of 20 days. Photo: U.S. Department of Energy, released as public domain.

Einsteinium

Einsteinium and fermium are produced in small amounts in explosions of hydrogen bombs, from the igniter plutonium and neutrons that are flying around. Einsteinium also can be made in labs, however the highly radioactive metal has no use outside of basic research. The most stable isotope 252 has a half-life of 472 days. Einsteinium of course was named after Albert Einstein, who himself had no connection to the element. Einsteinium decays to berkelium or californium.


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