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(), n.[NL., fr. Gr. , neut. of hidden.] (Chem.) An inert gaseous element of the argon group, occurring in air to the extent of about one volume in a million. It was discovered by Ramsay and Travers in 1898. Liquefying point, -- 152 C.; symbol, Kr; atomic weight, 83.0. スポンサード リンク
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