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europium 音标拼音: [jʊr'opiəm] n. 铕 铕 europium n 1: a bivalent and trivalent metallic element of the rare earth group [synonym: {europium}, {Eu}, {atomic number 63}] Europium \Eu*ro"pi*um\, n. [NL.; Europe -ium, as in aluminium.] (Chem.) A metallic element of the rare-earth group (Lanthanide series), discovered spectroscopically by Demarcay in 1896. Symbol, Eu; atomic number 63; at. wt., 151.965 (C=12.011); valence = 2 or 3. [Webster 1913 Suppl. PJC] europium
Symbol: Eu Atomic number: 63 Atomic weight: 151.25 Soft silvery metallic element belonging to the lanthanoids. Eu-151 and Eu-153 are the only two stable isotopes, both of which are {neutron} absorbers. Discovered in 1889 by Sir William Crookes.
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