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放射性元素
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copernicium
人工放射性元素,元素符号Cn,原子序数112,半衰期最长的同位素的质量数285。属周期系ⅡB族。为纪念波兰天文学家N.哥白尼[注]而命名。曾被称为112号元素(ununbium),符号Uub。
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