|Group||9||Melting point||2446°C, 4435°F, 2719 K|
|Period||6||Boiling point||4428°C, 8002°F, 4701 K|
|Block||d||Density (g cm−3)||22.5622|
|Atomic number||77||Relative atomic mass||192.217|
|State at 20°C||Solid||Key isotopes||193Ir|
|Electron configuration||[Xe] 4f145d76s2||CAS number||7439-88-5|
|ChemSpider ID||22367||ChemSpider is a free chemical structure database|
- Iridium is a transition metal of the platinum family with symbol Ir and atomic number 77 in the periodic table.
- Iridium is a hard, lustrous, brittle, dense transition metal of the platinum family.
- It is silverish-white and it is known to be the most corrosion resistant element known. It is unaffected by air, water, and acids.
- It is one of the lesser known members of the platinum group, iridium possesses quite remarkable physical and chemical properties.
- Not only is the most corrosion resistant of all metals, it is insoluble in all mineral acids at high temperatures, but has a very high melting point and is the only metal that can maintain good mechanical properties in air temperatures above 1600°C.
- It has a high modulus of rigidity and elasticity.
- Nowadays the automotive industry, chemical industry and electronic industry, have the most demand for iridium, where it is used to coat the electrodes in the chlor-alkali process, and in catalyst.
- Some applications are in pivot bearings and in scientific and other special equipment, but it is principally used in alloys: osmium/iridium alloys are used for tipping fountain pen nibs and for compass bearings.
- It is also known to be used in Space vehicles and Satellites.