(Chemical symbol Au). Element with atomic number 79, atomic weight 196.96, mp 1063C, specific gravity 18.88. Native gold usually contains some copper and silver. Typical gold concentrations are 85-95% with the remainder being mostly silver. Gold is bright yellow, but with increasing silver content the colour is white, while copper provides red tints to the colour. Platinum from 20-25% and nickel make the alloy with gold white.