英语词汇“radioactinium”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	radioactinium
释义	WordReference Random House Unabridged Dictionary of American English © 2024 ra•di•o•ac•tin•i•um (rā′dē ō ak tin′ē əm),USA pronunciation n. [Chem.] Chemistrythe radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227 radio- + actinium 1905–10
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