 Europium is a chemical element with symbol Eu and atomic number 63 . It was isolated in 1901 and is named after the continent of Europe . 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 ; only about 5 × 10 − 8 % of all matter in the universe is europium . 
 Europium <a href='drop_aux' title='1'><mark>is</mark></a>a chemical element with symbol Eu and atomic number 63 . It was isolated in 1901 and is named after the continent of Europe . It <a href='drop_aux' title='2'><mark>is</mark></a>a moderately hard , silvery metal which readily <a href='uninflect' title='3'><mark>oxidizes</mark></a> in air and water . Being a typical member of the lanthanide series , europium usually <a href='uninflect' title='4'><mark>assumes</mark></a> the oxidation state + 3 , but the oxidation state + 2 <a href='drop_aux' title='5'><mark>is</mark></a>also common : all europium compounds with oxidation state + 2 are slightly reducing . Europium <a href='got' title='6'><mark>has</mark></a> no significant biological role and <a href='drop_aux' title='7'><mark>is</mark></a>relatively non @-@ toxic compared to other heavy metals . Most applications of europium exploit the phosphorescence of europium compounds . Europium <a href='drop_aux' title='8'><mark>is</mark></a>one of the least abundant elements in the universe ; only about 5 × 10 − 8 % of all matter in the universe <a href='drop_aux' title='9'><mark>is</mark></a>europium . 
Europium a chemical element with symbol Eu and atomic number 63 . It was isolated in 1901 and is named after da continent of Europe . It a moderately hard , silvery metal which readily oxidize in air and water . Being a typical member of the lanthanide series , europium usually assume the oxidation state + 3 , but tdaoxidation state + 2 also common : alll europium compounds with oxidation state + 2 r slightly reducing . Europium got no significant biological role and relatively non @-@ toxic compared to other heavy metals . Most applications of europium exploit the phosphorescence of europium compounds . Europium one of thdaeast abundant elements in the universe ; only abt 5 × 10 − 8 % ofallll matter in the universe europium .