fermium
Synthesized, radioactive, metallic element of the actinide series, atomic number 100, relative atomic mass 257.10. Ten isotopes are known, the longest-lived of which, Fm-257, has a half-life of 80 days. Fermium has been produced only in minute quantities in particle accelerators.
It was discovered in 1952 in the debris of the first thermonuclear explosion. The element was named in 1955 in honour of Italian-US physicist Enrico Fermi.
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