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放射性元素
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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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