鍆,化學元素也,符號Md,原子序一百零一,屬錒系,乃人工製之。一九五五年,吉奧索等人轟鎄以氦核得之。因不可從鈾、鈽製得,故其形難見。名以俄人門捷列夫。
鍆同位素凡十六,自鍆二四五至鍆二六零,其皆具放射性。性至穩者鍆二五八,每五十一天折半,鍆二五六稍穩,則只每五十八分鐘折半。因其可豐產於鎄及氦核間,鍆二五六最適實驗,亦爲其同位素研究之至重。
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