Definition of fermium in English:


Translate fermium into Spanish


(also Fm)
  • The chemical element of atomic number 100, a radioactive metal of the actinide series. Fermium does not occur naturally and was discovered in 1953 in the debris of the first hydrogen bomb explosion.

    ‘Scientists have for the first time literally shed light on properties of the radioactive element fermium - a metal discovered some 50 years ago.’
    • ‘All isotopes of fermium are radioactive, with fermium-257 having the longest half life, 20.1 hours.’
    • ‘The transfermium elements are those elements with atomic numbers greater than 100, the atomic number for fermium.’
    • ‘The Dubna group had made fermium and rutherfordium this way in the 1970s.’



/ˈfermēəm/ /ˈfɛrmiəm/ /ˈfərmēəm/ /ˈfərmiəm/


1950s from the name of Fermi, Enrico+ -ium.