osmium definition

  • noun:
    • A bluish-white, tough metallic factor, present in a small amount in osmiridium, nickel, and platinum ores. It really is made use of as a platinum hardener plus in making pen things, phonograph needles, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling-point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8. See Table at element.
    • much metallic substance factor (expression Os) with an atomic range 76
    • an uncommon metallic section of the platinum team with atomic number 76. Its discovered indigenous as an alloy in platinum ore, plus in iridosmine. Its a tough, infusible, bluish or grayish white material, and heaviest material understood. Its tetroxide is employed in histological experiments to stain areas. Symbol os. Atomic weight 190.2. Specific gravity 22.477.
    • Chemical sign, Os; atomic fat, 191. Among metals associated with the platina group.
    • This, the absolute most refractory for the metals, has actually, though with difficulty, been completely fused into globules in the shape of the electric furnace.
    • a tough brittle blue-grey or blue-black metallic element this is certainly the platinum metals; the heaviest steel known

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