Iridium - Wikipedia
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.
Periodic Table - Ptable
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Iridium - Element information, properties and uses | Periodic ...
Element Iridium (Ir), Group 9, Atomic Number 77, d-block, Mass 192.217. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Iridium | Definition, Properties, & Uses | Britannica
Iridium, chemical element, one of the platinum metals of Groups 8–10 (VIIIb), Periods 5 and 6, of the periodic table. It is very dense and rare and is used in platinum alloys. A precious, silver-white metal, iridium is hard and brittle, but it becomes ductile and can be worked at a white heat.
Iridium | Ir (Element) - PubChem
Periodic Table element Summary Iridium. Iridium is a chemical element with symbol Ir and atomic number 77. Classified as a transition metal, Iridium is a solid at room temperature.
Iridium (Ir) - Periodic Table
Iridium is the 77th element in the periodic table and has a symbol of Ir and atomic number of 77. It has an atomic weight of 192.217 and a mass number of 193. Iridium has seventy-seven protons and one hundred sixteen neutrons in its nucleus, and seventy-seven electrons in six shells.
WebElements Periodic Table » Iridium » the essentials
Iridium is white, similar to platinum, but with a slight yellowish cast. It is very hard and brittle, making it very hard to machine, form, or work. It is the most corrosion resistant metal known, and was used in making the standard metre bar of Paris, which is a 90% platinum-10% iridium alloy.