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A chemical element or element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei (i.e. the same atomic number, Z).
Ru - a rare polyvalent metallic element of the platinum group; it is found associated with platinum. atomic number 44, ruthenium. 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.