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
Ir, iridium
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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References in periodicals archive
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.
Unusually-bright satellite flare forecast on Sunday
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