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 0369 (OTTOKEMI) Gold sputtering target, diam. × thickness 2 inch × 0.25 inch, 99.99% - used for the protective coatings on many artificial satellites.