iridium definition

  • noun:
    • A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element occurring in platinum ores and used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant bearings. Atomic number 77; atomic weight 192.2; melting point 2,410°C; boiling point 4,130°C; specific gravity 22.42 (at 17°C); valence 3, 4. See Table at element.
    • A metallic substance element (symbolization Ir) with an atomic amount of 77.
    • an unusual metallic element of atomic quantity 77, of the same group as platinum, which it much resembles, being silver-white and indifferent to most corrosive representatives, but harder, much more brittle, along with a higher melting temperature (2410° C, versus platinum 1772° C). With the exception of osmium, it will be the heaviest compound understood, its specific-gravity being 22.4. Representation Ir. Atomic fat 192.22.
    • Chemical image, Ir; atomic body weight, 193. A metal of silver-white shade, from the platinum household, and, as far as understood, constantly contained in native platinum.
    • a heavy brittle metallic part of the platinum team; used in alloys; does occur in all-natural alloys with platinum or osmium

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