atomic number 67


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Noun1.atomic number 67 - a trivalent metallic element of the rare earth groupatomic number 67 - a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium