What is osmium?

  • (noun): A hard brittle blue-gray or blue-black metallic element that is one of the platinum metals; the heaviest metal known.
    Synonyms: Os, atomic number 76


Osmium is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, blue-gray or blue-black transition metal in the platinum family and is the densest naturally occurring element, with a density of 22.59 g/cm3 (slightly greater than that of iridium and twice that of lead). It is found in nature as an alloy, mostly in platinum ores; its alloys with platinum, iridium, and other platinum group metals are employed in fountain pen tips, electrical contacts, and other applications where extreme durability and hardness are needed.

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Some articles on osmium:

Staining Dyes - Electron Microscopy - Osmium Tetroxide
... Osmium tetroxide is used in optical microscopy to stain lipids ... reduced by organic materials to elemental osmium, an easily visible black substance ... It is a strong oxidizing agent as the osmium has an oxidation number of +8 ...
Synthesis Of Precious Metals - Osmium
... The cost of osmium as of January 2010 was $12,217 per kilogram, making it roughly twice the price of rhenium, which is worth $6,250/kg ...
Osmium - Price
... Osmium is usually sold as a 99% pure powder ... Like other precious metals, it is measured by troy weight and by grams ...
List Of CAS Numbers By Chemical Compound - O
... CAS number OF2 oxygen(II) fluoride 7783-41-7 O2F2 oxygen(I) fluoride 7783-44-0 OsBr3 osmium(III) bromide 59201-51-3 OsBr4 osmium(IV) bromide 59201-52-4 Os(C5H5)2 osmium(II) cyclopentadienide ...
Rhenium-osmium Dating
... Rhenium-Osmium dating is a form of radiometric dating based on the beta decay of the isotope 187Re to 187Os ... Both rhenium and osmium are strongly siderophilic (iron loving), while Re is also chalcophilic (sulfur loving) making it useful in dating sulfide ores such as ...