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rare earth element

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TREE more like this
definition As defined by IUPAC, a rare earth element (REE) or rare earth metal is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium. Scandium and yttrium are considered rare earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties. more like this
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broader rare-earth-element original original
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02.01.03 more like this
REE more like this
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is primary topic of rare-earth-element