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单词 roentgenium
释义

roentgenium

noun
/ˌrɒntˈɡiːniəm/
/ˌrentˈɡiːniəm/
[uncountable]
(symbol Rg)
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  1. a chemical element. Roentgenium is a radioactive element that is produced artificially and has no known use.
    • the discovery and naming of roentgenium
    • Roentgenium has no stable isotopes.
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更新时间:2024/12/23 21:16:14