atomic number 51


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Noun1.atomic number 51 - a metallic element having four allotropic formsatomic number 51 - a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite
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.
stibnite - a soft grey mineral; the chief ore of antimony