鑀者,亦作鎄,化學元素也,符號Es,原子序九十九,首現於核試驗殘渣中,又可於反應堆中,以鐦衰變得之。其色銀白,質稍軟,其同位素可射輝光,置暗夜中,仍熠熠然。
鑀同位素凡十九,自鑀二四零至鑀二五八,其皆具放射性。性至穏者鑀二五二,近每四百七十二天折半,然鑀二五三較前者更爲常見。雖鑀二五二更適研究,然其難以豐產於鐦中,故近無實用。
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