鍩,化學元素也,符號No,原子序一百零二,屬錒系,乃人工製之,自鍆後元素皆難得於鈾、鈽,乃轟鋦以碳原子得之。其氧化數多正二,希有正三。名以發明家諾貝爾。
鍩同位素凡十二,自鍩二五零至鍩二六二,其皆具放射性。性至穩者鍩二五九,每五十八分鐘折半,鍩二五五半衰甚短於前者,然其可豐產於加速器中,故最適實驗。
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