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dubnium
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dubnium
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放射性元素
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dubnium
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人工放射性元素,元素符号Db,原子序数105,半衰期最长的同位素的质量数268。属周期系ⅤB族。以俄罗斯杜布纳联合核子研究所所在地杜布纳(Dubna)命名。
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