Question: what are the physical and chemical properties of iridium?
Answer: Iridium metal is silvery-white with a density of 22.65 grams per cubic centimeter. A cubic centimeter of iridium weighs 22.65 times as much as a cubic centimeter of water. It is the most dense element known. Iridium has a melting point of 2,443°C (4,429°F) and a boiling point of about 4,500°C (8,130°F).