what is rare earth ?
sushant22:
i thought there should be rare earth metals or elements
is it??
or just rare earth??
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A rare-earth element (REE) or rare-earth metal (REM), as defined by IUPAC, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore .
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