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Noun: atomic number 70
  1. A soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
    "Ytterbium, atomic number 70, is sometimes used in certain stainless steels";
    - ytterbium, Yb

Type of: metal, metallic element

Part of: gadolinite, monazite, xenotime, ytterbite