INSPIRE
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rare earth element

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Label:
rare earth element
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. - http://en.wikipedia.org/wiki/Rare_earth_element
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Label Governance level Status
HREE eu-technical Valid
LREE eu-technical Valid