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镭(léi)(法語:Radium;舊譯鈤、銧),是一种化學元素。其化學符號为Ra,原子序數为88。鐳是元素週期表2A族中最重的元素,是一種銀白色有光澤的放射性鹼土金屬,在空气中會迅速和氮气(而非氧气...
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