atomic number 77


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Noun1.atomic number 77 - a heavy brittle metallic element of the platinum groupatomic number 77 - a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
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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The original concept for the constellation was to have 77 satellites, which is where the name Iridium comes from because it is the element with the atomic number 77.