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roentgenium
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roentgenium
Encyclopedia
理学
放射性元素
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roentgenium
𬬭
人工放射性元素,元素符号Rg,原子序数111,半衰期最长的同位素的质量数282。属周期系ⅠB族。为纪念德国物理学家W.K.伦琴[注]而命名。曾被称为111号元素(unununium),符号Uuu。
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natural norm
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natural nuclide
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natural number of a logarithm
natural number sequence
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natural object, natural scene
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natural operator
natural optical background
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