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放射性元素
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meitnerium
人工放射性元素,元素符号Mt,原子序数109,半衰期最长的同位素的质量数278。属周期系Ⅷ族。为纪念核物理学家和放射化学家L.迈特纳[注]而命名。曾被称为109号元素(unnilennium),符号Une。
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