atomic number 71


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Related to atomic number 71: Cassiopeium
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Noun1.atomic number 71 - a trivalent metallic element of the rare earth groupatomic number 71 - a trivalent metallic element of the rare earth group; usually occurs in association 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.
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