鈹者,舊譯鑉、鋍,化學元素也,符號Be,原子序四。屬鹼土金屬,故作金部。
地球以內,世所罕有,豐度居各元素之卅二位,可從綠柱石得之。
一七九八年,法人沃克朗從綠玉石、翡翠察之,公諸世。一八二八年,德人維勒、法人畢於西分別得其單質。
其同位素有八,自鈹六迄鈹十二、鈹十四,性穩者獨鈹九,餘者之核不安也,常衰變,皆具放射性。
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