Word: transuranium
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Dates: during 1940-1949
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...Verification of the transuranium chemical elements...
...Jean Perrin. 71, refugee French physicist, 1926 winner of the Nobel Prize; in Manhattan. A onetime associate of the Curies, famed for his studies of molecular physics, he announced in 1938 that he had discovered evidence of the existence of an element heavier than element 92 (uranium), called it transuranium...