单词	radium
释义	radium /ˈreɪdɪəm / noun [mass noun] The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy. (Symbol: Ra) Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium.... All isotopes of radium are radioactive with radium - 226 being the most stable. The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy. Origin Late 19th century: from Latin radius 'ray' + -ium. Rhymes palladium, stadium, vanadium
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