| 单词 | radium |
| 释义 | Word Frequency radium(ˈreɪdɪəm) noun a. a highly radioactive luminescent white element of the alkaline earth group of metals. It occurs in pitchblende, carnotite, and other uranium ores, and is used in radiotherapy and in luminous paints. Symbol: Ra; atomic no: 88; half-life of most stable isotope,226Ra: 1620 years; valency: 2; relative density: 5; melting pt: 700°C; boiling pt: 1140°C b. (as modifier) radium needle Word origin C20: from Latin radius ray |
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