鎶者,化學元素也,符號為Cn,原子序一百一十二,屬過渡金屬、超錒元素、鋅副族。極易衰變,富放射能。天然之中,無有其存。今所得鎶,悉為人造。一九九二年,德國人西格霍夫曼、維克托尼諾夫並索之。二零一零年,國際純化學暨應用化學聯合會確認其存,值波蘭天文學家哥白尼誕辰,因名曰鎶,以誌其功。
其性不穩,同位素悉短壽,皆幾稀。鎶二八五,二十九秒折半;鎶二八三,四秒折半。壽雖不永,較諸相鄰元素,已然久長,蓋在穩定島故也。
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