Osmium is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 700422590000000000022.59 g/cm^3.

Atomic Weight:  535
Density:        5353 g/cm3
Melting Point:  656 °C
 Boiling Point: 5656 °C