Iridium

Iridium is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second-densest element (after osmium) and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.

Iridium was discovered in 1803 among insoluble impurities in natural platinum. Smithson Tennant, the primary discoverer, named the iridium for the goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium is one of the rarest elements in the Earth's crust, with annual production and consumption of only three tonnes. 191Ir and 193Ir are the only two naturally occurring isotopes of iridium as well as the only stable isotopes; the latter is the more abundant of the two.

The most important iridium compounds in use are the salts and acids it forms with chlorine, though iridium also forms a number of organometallic compounds used in industrial catalysis, and in research. Iridium metal is employed when high corrosion resistance at high temperatures is needed, as in high-end spark plugs, crucibles for recrystallization of semiconductors at high temperatures, and electrodes for the production of chlorine in the chloralkali process. Iridium radioisotopes are used in some radioisotope thermoelectric generators.

Iridium is found in meteorites with an abundance much higher than its average abundance in the Earth's crust. For this reason the unusually high abundance of iridium in the clay layer at the Cretaceous–Paleogene boundary gave rise to the Alvarez hypothesis that the impact of a massive extraterrestrial object caused the extinction of dinosaurs and many other species 65 million years ago. It is thought that the total amount of iridium in the planet Earth is much higher than that observed in crustal rocks, but as with other platinum group metals, the high density and tendency of iridium to bond with iron caused most iridium to descend below the crust when the planet was young and still molten.

Read more about Iridium:  History, Occurrence, Production, Applications, Precautions

Other articles related to "iridium":

Iridium (disambiguation)
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Commonly Used Gamma Emitting Isotopes - Activation Products
... Some radionuclides, for example cobalt-60 and iridium-192, are made by the neutron irradiation of normal non-radioactive cobalt and iridium metal in ... In addition to their uses in radiography, both cobalt-60 (Co-60) and iridium-192 (Ir-192) are used in the radiotherapy of cancer ... used in teletherapy units as a higher photon energy alternative to Cs-137, while iridium-192 tends to be used in a different mode of therapy, internal radiotherapy or brachytherapy ...
Kosmos 2251 - Destruction
... At 1656 UTC on 10 February 2009, it collided with Iridium 33, an Iridium satellite, in the first major collision of two satellites in Earth orbit ... The Iridium satellite, which was operational at the time of the collision, was destroyed, as was Kosmos-2251 ...
Iridium - Precautions
... Iridium in bulk metallic form is not biologically important or hazardous to health due to its lack of reactivity with tissues there are only about 20 ... However, finely divided iridium powder can be hazardous to handle, as it is an irritant and may ignite in air ... Very little is known about the toxicity of iridium compounds because they are used in very small amounts, but soluble salts, such as the iridium ...
List Of CAS Numbers By Chemical Compound - I
12030-24-9 In2Se3 indium(III) selenide 1312-42-1 In2Te3 indium(III) telluride 1312-45-4 IrBr2 iridium(II) bromide 77791-70-9 IrBr3 iridium(III) bromide 10049-24-8 IrBr4 iridium(IV) bromide 7789-64-2 ...