英语词汇“radon”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

单词	radon
释义	Trends of radon View usage for: radon (reɪdɒn) uncountable noun Radon is a radioactive element in the form of a gas. radon in British English (ˈreɪdɒn) noun a colourless radioactive element of the rare gas group, the most stable isotope of which, radon-222, is a decay product of radium. It is used as an alpha particle source in radiotherapy. Symbol: Rn; atomic no: 86; half-life of 222Rn: 3.82 days; valency: 0; density: 9.73 kg/m3; melting pt: –71°C; boiling pt: –61.7°C Word origin C20: from radium + -on radon in American English (ˈreɪˌdɑn) noun a radioactive, gaseous chemical element, one of the noble gases, formed, together with alpha rays, as a first product in the atomic disintegration of radium: symbol, Rn; at. no.,86 Word origin radium + -on Word lists with radon chemical, Types of gas
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Trends ofradon