lanthanum :

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lan thuh nuhm

  • n  a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

  • Now Chu's team tried lanthanum, the rare-earth component of the IBM compound.
  • They have tongue-twisting names (praseodymium, gadolinium, cerium, lanthanum, ytterbium, etc.
  • It is compounded of three rare metals: tantalum, tungsten, lanthanum.
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