atomic number 77

Definitions of atomic number 77
  1. noun
    a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
    synonyms: Ir, iridium
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    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.
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