单词	ionium
释义	ionium noun io·​ni·​um ī-ˈō-nē-əm  : a natural radioactive isotope of thorium having a mass number of 230 Example Sentences Recent Examples on the Web Rona set to work isolating a potential new element called ionium. New York Times, 28 Aug. 2019 Word History Etymology ion + -ium; so called from its ionizing action First Known Use 1907, in the meaning defined above Medical Definition ionium noun io·​ni·​um ī-ˈō-nē-əm  : a natural radioactive isotope of thorium having a mass number of 230
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