Definition of einsteinium in English:



(also Es)
  • The chemical element of atomic number 99, a radioactive metal of the actinide series. Einsteinium does not occur naturally and was discovered in 1953 in debris from the first hydrogen bomb explosion.

    ‘They were named after two of the century's most creative physicists: einsteinium and fermium.’
    • ‘All isotopes of einsteinium are radioactive, the most stable being einsteinium - 252 with a half life of 20.47 days.’
    • ‘Atomic number 101 is a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles.’
    • ‘A tiny sample of einsteinium - 253 was bombarded with alpha particles in the university's 60-inch cyclotron.’
    • ‘I don't know how Albert would have felt about this, but the element was named einsteinium, in his honor.’



/īnˈstīnēəm/ /aɪnˈstaɪniəm/


1950s from the name of Albert Einstein, Albert+ -ium.