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Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) as defined by experimental X-ray crystallography.
- silvery white
- group 9
- 77
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Iridium is the most corrosion-resistant material known. It is used in special alloys and forms an alloy with osmium, which is used for pen tips and compass bearings. It was used in making the standard metre bar, which is an alloy of 90% platinum and 10% iridium.
Apr 11, 2024 · Iridium is a rare and dense metal that belongs to the platinum group of elements. It is mainly used in platinum alloys for jewelry, electrical contacts, and the international kilogram standard.
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Iridium is a member of the platinum family and is white in color with a yellowish hue. It has a density of 22.65 grams per cubic centimeter. By comparison, the density of lead is 11.34 g/cm3 and the density of iron is 7.874 g/cm3. Iridium is not affected by acids, bases, or most other strong chemicals, according to Chemistry Explained. That propert...
Here are other properties of iridium, according to the Los Alamos National Laboratory: 1. Atomic number (number of protons in its nucleus): 77 2. Atomic symbol (on the Periodic Table of Elements): Ir 3. Atomic weight (average mass of the atom): 192.217 4. Melting point: 4,435 F (2,446 C) 5. Boiling point: 8,002.4 F (4,428 C) 6. Stable isotopes: 2, ...
Several chemists may have discovered iridium about the same time in 1803, according to an article in the journal Platinum Metals Review. English chemist Smithson Tennant, French chemists H.V. Collet-Descotils, A.F. Fourcroy and N.L. Vauquelin all are said to have found iridium in the acid-insoluble residues of platinum ores. Tennant usually gets th...
Today, iridium is commercially recovered as a byproduct of copper or nickel mining. Ore containing iridium is found in Brazil, the United States, Myanmar, South Africa, Russia and Australia. Pure iridium is so rare on the Earth's crust that there is only about 2 parts per billion located in the crust, according to Chemistry Explained. "Iridium is o...
Though brittle, iridium can be worked if heated to a white heat of 2,200 to 2,700 degrees Fahrenheit (1,200 to 1,500 degrees Celsius), according to Encyclopedia Britannica. Iridium's principal use is to harden platinum by making a platinum alloy. It is also used to make devices needed for high temperatures and in electrical contacts. It is also use...
Jan 10, 2020 · Learn about iridium, a white metal with a slight yellowish cast, very hard and brittle, and highly corrosion-resistant. Find out its uses, sources, properties, and history of discovery.
Iridium is a whitish silver transition metal. It is brittle solid at standard temperature and pressure. It is a significantly dense metal and is considered as the 2 nd densest element (22.56 g/cm 3 ). Iridium is considered as the most corrosion-resistant metal and does not react with water or oxygen even at high temperatures [3].
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