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单词 protactinium
释义

protactinium

/ˌprəʊtækˈtɪnɪəm/
noun
mass 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)
(化学元素)镤(符号: Pa)。
词源
early 20th cent.: from PROTO- 'original,earlier'+ACTINIUM,so named because one of its isotopes decays to form actinium.
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更新时间:2025/8/6 0:04:39