europium

3 definitions found

europium - Collaborative International Dictionary of English v.0.48 :

  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 - WordNet (r) 2.1 (2005) :

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

europium - Elements (07Nov00) :

  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.