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europium 音标拼音: [jʊr'opiəm]

n. 铕

铕

WordNet (r) 3.0 (2006) (WordNet)

europium
n 1: a bivalent and trivalent metallic element of the rare earth
group [synonym: {europium}, {Eu}, {atomic number 63}]

The Collaborative International Dictionary of English v.0.48 (gcide)

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]

The Elements Database (element)

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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