Protactinium - English meaning
Protactinium – definitions in English dictionary
nounThe chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium.
Usage examples:
Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, a…
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Word origin
early 20th century: from proto- ‘original, earlier’ + actinium, so named because one of its isotopes decays to form actinium.
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