Re os dating


04-Aug-2017 02:33

Because of its hardness, brittleness, low vapor pressure (the lowest of the platinum-group metals), and very high melting point (the fourth highest of all elements, after only carbon, tungsten, and rhenium), solid osmium is difficult to machine, form or work.

Osmium forms compounds with oxidation states ranging from −2 to 8.

Both methods are suitable for industrial scale production.

In either case, the product is reduced using hydrogen, yielding the metal as a powder or sponge that can be treated using powder metallurgy techniques.

Osmium (from Greek ὀσμή osme, "smell") is a chemical element with symbol Os and atomic number 76.

It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores.

The most common oxidation states are 2, 3, 4, and 8.

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Its alloys with platinum, iridium, and other platinum-group metals are employed in fountain pen nib tipping, electrical contacts, and other applications where extreme durability and hardness are needed.

The lower oxidation states are stabilized by the larger halogens, so that the trichloride, tribromide, triiodide, and even diiodide are known.

The oxidation state 1 is known only for osmium iodide (Os I), whereas several carbonyl complexes of osmium, such as triosmium dodecacarbonyl ( In general, the lower oxidation states of osmium are stabilized by ligands that are good σ-donors (such as amines) and π-acceptors (heterocycles containing nitrogen).

The largest known primary reserves are in the Bushveld Igneous Complex in South Africa, The alluvial deposits used by pre-Columbian people in the Chocó Department, Colombia are still a source for platinum group metals.

The second large alluvial deposit was found in the Ural Mountains, Russia, which is still mined.Although osmium is one of the even-numbered elements, which puts it in the upper half of elements commonly found in space, osmium is the least abundant stable element in Earth's crust with an average mass fraction of 50 parts per trillion in the continental crust.



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