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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。
| 聲音動静，具錄於維基共享︰鑀 |
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