英语词汇“francium”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	francium
释义	Trends of francium View usage for: francium in British English (ˈfrænsɪəm) noun an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt: 27°C; boiling pt: 677°C Word origin C20: from New Latin, from France + -ium; so-called because first found in France francium in American English (ˈfrænsiəm) noun a radioactive chemical element, an alkali metal, existing in minute amounts in nature as a decay product of actinium: symbol, Fr; at. no., 87 Word origin ModL < France2 + -ium Word lists with francium chemical
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Trends offrancium