Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Iridium> ?p ?o }
- Iridium abstract "Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium) based on measured density, although calculations involving the space lattices of the elements show that iridium is denser. It is also 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 iridium for the Greek goddess Iris, personification of the rainbow, because of the striking and diverse colors of its salts. Iridium is one of the rarest elements in 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-performance 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 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 66 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.".
- Iridium thumbnail Iridium2.jpg?width=300.
- Iridium wikiPageExternalLink iridium-Ir.
- Iridium wikiPageExternalLink 077.htm.
- Iridium wikiPageID "14752".
- Iridium wikiPageLength "58820".
- Iridium wikiPageOutDegree "294".
- Iridium wikiPageRevisionID "708021572".
- Iridium wikiPageWikiLink 9,10-Diphenylanthracene.
- Iridium wikiPageWikiLink Abundance_of_elements_in_Earths_crust.
- Iridium wikiPageWikiLink Acetic_acid.
- Iridium wikiPageWikiLink Acid.
- Iridium wikiPageWikiLink Acute_radiation_syndrome.
- Iridium wikiPageWikiLink Alkane.
- Iridium wikiPageWikiLink Alloy.
- Iridium wikiPageWikiLink Alluvium.
- Iridium wikiPageWikiLink Alpha_decay.
- Iridium wikiPageWikiLink Aluminium.
- Iridium wikiPageWikiLink Alvarez_hypothesis.
- Iridium wikiPageWikiLink Ammonium_hexachloroiridate.
- Iridium wikiPageWikiLink Anode.
- Iridium wikiPageWikiLink Antimatter.
- Iridium wikiPageWikiLink Antimonide.
- Iridium wikiPageWikiLink Antiproton.
- Iridium wikiPageWikiLink Antoine_François,_comte_de_Fourcroy.
- Iridium wikiPageWikiLink Aqua_regia.
- Iridium wikiPageWikiLink Arsenide.
- Iridium wikiPageWikiLink Asteroid.
- Iridium wikiPageWikiLink Asymmetric_hydrogenation.
- Iridium wikiPageWikiLink Atomic_number.
- Iridium wikiPageWikiLink Beta_decay.
- Iridium wikiPageWikiLink Beta_particle.
- Iridium wikiPageWikiLink Binary_compound.
- Iridium wikiPageWikiLink Brachytherapy.
- Iridium wikiPageWikiLink Bushveld_Igneous_Complex.
- Iridium wikiPageWikiLink Canada.
- Iridium wikiPageWikiLink Cannon.
- Iridium wikiPageWikiLink Carbon.
- Iridium wikiPageWikiLink Carbonylation.
- Iridium wikiPageWikiLink Carbon–hydrogen_bond.
- Iridium wikiPageWikiLink Carbon–hydrogen_bond_activation.
- Iridium wikiPageWikiLink Cassini–Huygens.
- Iridium wikiPageWikiLink Catalysis.
- Iridium wikiPageWikiLink Category:Chemical_elements.
- Iridium wikiPageWikiLink Category:Impact_event_minerals.
- Iridium wikiPageWikiLink Category:Iridium.
- Iridium wikiPageWikiLink Category:Meteorite_minerals.
- Iridium wikiPageWikiLink Category:Noble_metals.
- Iridium wikiPageWikiLink Category:Precious_metals.
- Iridium wikiPageWikiLink Category:Transition_metals.
- Iridium wikiPageWikiLink Cativa_process.
- Iridium wikiPageWikiLink Chandra_X-ray_Observatory.
- Iridium wikiPageWikiLink Chemical_element.
- Iridium wikiPageWikiLink Chicxulub_crater.
- Iridium wikiPageWikiLink Chloralkali_process.
- Iridium wikiPageWikiLink Chlorine.
- Iridium wikiPageWikiLink Chocó_Department.
- Iridium wikiPageWikiLink Chromium.
- Iridium wikiPageWikiLink Colombia.
- Iridium wikiPageWikiLink Comet.
- Iridium wikiPageWikiLink Compass.
- Iridium wikiPageWikiLink Coordination_complex.
- Iridium wikiPageWikiLink Copper.
- Iridium wikiPageWikiLink Copper_extraction_techniques.
- Iridium wikiPageWikiLink Corrosion.
- Iridium wikiPageWikiLink Corundum.
- Iridium wikiPageWikiLink Crabtrees_catalyst.
- Iridium wikiPageWikiLink Cretaceous.
- Iridium wikiPageWikiLink Cretaceous–Paleogene_boundary.
- Iridium wikiPageWikiLink Cretaceous–Paleogene_extinction_event.
- Iridium wikiPageWikiLink Crucible.
- Iridium wikiPageWikiLink Crust_(geology).
- Iridium wikiPageWikiLink Czochralski_process.
- Iridium wikiPageWikiLink Density.
- Iridium wikiPageWikiLink Diamagnetism.
- Iridium wikiPageWikiLink Dinosaur.
- Iridium wikiPageWikiLink Earth.
- Iridium wikiPageWikiLink Elastic_modulus.
- Iridium wikiPageWikiLink Electron_capture.
- Iridium wikiPageWikiLink Emission_spectrum.
- Iridium wikiPageWikiLink Enantiomer.
- Iridium wikiPageWikiLink Fluorine.
- Iridium wikiPageWikiLink Fountain_pen.
- Iridium wikiPageWikiLink Gadolinium_gallium_garnet.
- Iridium wikiPageWikiLink Galileo_(spacecraft).
- Iridium wikiPageWikiLink Gamma_ray.
- Iridium wikiPageWikiLink Geologic_time_scale.
- Iridium wikiPageWikiLink Gold.
- Iridium wikiPageWikiLink Goldschmidt_classification.
- Iridium wikiPageWikiLink Graphite.
- Iridium wikiPageWikiLink Half-life.
- Iridium wikiPageWikiLink Halogen.
- Iridium wikiPageWikiLink Hardness.
- Iridium wikiPageWikiLink Henri_Étienne_Sainte-Claire_Deville.
- Iridium wikiPageWikiLink Hippolyte-Victor_Collet-Descotils.
- Iridium wikiPageWikiLink History_of_the_metre.
- Iridium wikiPageWikiLink Homogeneous_catalysis.
- Iridium wikiPageWikiLink Hydrazine.
- Iridium wikiPageWikiLink Hydride.
- Iridium wikiPageWikiLink Hydrochloric_acid.