atomic number 68

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Noun

atomic number 68 - a trivalent metallic element of the rare earth group; occurs with yttrium

Er, erbium

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

gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium

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