(Chemical symbol, Pt). A grayish-white precious metallic element which is not easily oxidized. It is ductile, malleable, and non-corrosive, and is difficult to fuse. It is used extensively for electrical contacts, thermocouples, laboratory equipment and jewelry. It can be alloyed with palladium, iridium and other metals such as copper and nickel. Atomic weight, 195; atomic number, 78; melting point, 1755°C (3191°F);
specific gravity, 21.4.
