`platinum-group` Related Article Results

Iridium is an element with the symbol Ir and atomic number 77. It belongs to the platinum group and is found in very small quantities in nature. It has a silvery-white color and a bright luster. Due to its extremely limited presence on Earth it is classified among the precious metals. Physical Properties Iridium is a very hard dense and brittle metal. It has a high melting point and is highly resistant to degradation. Due to its density it is one of the heaviest elements in the periodic table. I