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субстанце > елементи > metals (en) > rare earth elements (en)

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DEFINITION

  • A rare-earth element or rare-earth metal, 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. (en)

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URI

http://aims.fao.org/aos/agrovoc/c_24889

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