atomic number 68
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|Noun||1.||atomic number 68 - a trivalent metallic element of the rare earth group; occurs with yttrium|
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.
fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals
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