Gold

Element, chemical symbol Au. A yellow mineral that is the most malleable and pliable of all metals. It is also very soft and ductile, and noted for its resistance to corrosive media and high thermal and electrical conductivity. Used primarily as a coating or plating as it does not tarnish or corrode, and is unaffected by exposure to air or water. Also used as conductor in printed circuit. Along with copper and silver, these three metals are known as the “noble metals.”