fermiumn.
/ˈfəːmɪəm/, U.S. /ˈfɛrmiəm/, /ˈfərmiəm/ Chemistry.
An artificially produced radioactive element, atomic number 100. Symbol Fm.
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fermium1955
1955 A. Ghiorso et al. in Physical Rev. 1 Aug. 1049/1 We suggest for the element with the atomic number 99 the name einsteinium (symbol E) after Albert Einstein, and for the element with atomic number 100 the name fermium (symbol Fm), after Enrico Fermi.
1957 J. J. Katz & G. T. Seaborg Chem. Actinide Elem. x. 403 In all respects fermium in aqueous solutions behaves as a tripositive ion.
1966 New Scientist 23 June 774/1 Fermium-257, hitherto the heaviest material ever created by man.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).
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n.1955