1. [syn: europium, Eu, atomic number 63]
The Collaborative International Dictionary of English v.0.48:
Europium \Eu*ro"pi*um\, n. [NL.; Europe + -ium, as in
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]
WordNet (r) 3.0 (2006):
n 1: a bivalent and trivalent metallic element of the rare earth
group [syn: europium, Eu, atomic number 63]
The Elements (07Nov00):
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.