Tuesday, October 26, 2004


(Eu), chemical element, rare-earth metal of transition Group IIIb of the periodic table; it is the least dense, softest, and most volatile member of the lanthanide series. The element was discovered (1896) by Eug�ne-Anatole Demar�ay and named for Europe. One of the least abundant rare earths, it occurs in minute amounts in many rare-earth minerals such as monazite and also in the


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