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 the second densest element (after osmium). It is also the most corrosion-resistant metal, even at temperatures as high as 2000C.

Atomic Weight: 242.2525
Density        224.2445 g/cm^3.
Melting Point: 53.35
Boiling Point: 93.34