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europium
Europium is a chemical element with symbol Eu and atomic number 63. It was discovered in 1901 and is named after the continent of Europe.〔(【引用サイトリンク】publisher=Royal Society of Chemistry )〕 It is a moderately hard, silvery metal which readily oxidizes in air and water. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3, but the oxidation state +2 is also common: all europium compounds with oxidation state +2 are slightly reducing. Europium has no significant biological role and is relatively non-toxic compared to other heavy metals. Most applications of europium exploit the phosphorescence of europium compounds. Europium is one of the least abundant elements in the universe, with only about % in the entire universe.〔()〕
==Characteristics==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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