atomic number 23
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|Noun||1.||atomic number 23 - a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite|
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.
carnotite - a yellow radioactive mineral; an ore of uranium and radium and vanadium
vanadinite - a mineral consisting of chloride and vanadate of lead; a source of vanadium