Gold is a chemical element with the symbol Au - and the atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal.
G 0621 (OTTO) Gold sputtering target, diam. × thickness 2 in. × 3 mm, 99.99% - used in electrical contacts because of its resistance to corrosion, electrical conductivity, ductility and lack of toxicity.[