protactinium

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Concise Oxford English Dictionary © 2008 Oxford University Press:
protactinium /ˌprəʊtakˈtɪnɪəm/

▶noun the 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. (Symbol: Pa)

– origin early 20th cent.: from proto- + actinium, so named because one of its isotopes decays to form actinium.

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