atomic number 72

Noun
  1. A grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals;
    Used in filaments for its ready emission of electrons (synset 114663734)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    same as: hafnium, hf

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