单词	francium
释义	francium noun fran·​ci·​um ˈfran(t)-sē-əm  : a short-lived radioactive element of the alkali-metal group occurring naturally as a disintegration product of actinium and also produced artificially see Chemical Elements Table Example Sentences Recent Examples on the Web Perey, being French, decided to call it francium instead. Neima Jahromi, The New Yorker, 27 Dec. 2019 Word History Etymology New Latin, from France First Known Use 1946, in the meaning defined above Medical Definition francium noun fran·​ci·​um ˈfran(t)-sē-əm  : a radioactive element of the alkali-metal group discovered as a disintegration product of actinium and obtained artificially by the bombardment of thorium with protons —symbol Fr see Chemical Elements Table
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