atomic number 72


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Noun1.atomic number 72 - a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium mineralsatomic number 72 - a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
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.