rare-earthelement

rare-earthelement
rare-earth element (râr'ûrthʹ) n.
Any of the abundant metallic elements of atomic number 57 through 71. Also called lanthanide.
  [So called because they were originally thought to be rare.]

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Universalium. 2010.

Игры ⚽ Поможем написать курсовую

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