The price is of 56.73 USD per gram. Beside the traditional use in jewelry, gold can be used as an electrical conductor and to prevent corrosion. The ' gold is the ' chemical element of atomic number 79. Its symbol is Au (from the Latin "aurum"). It is a transition metal soft , heavy , ductile , malleable yellow. The gold, copper and cesium are the only elements in the metallic state, in standard conditions , it is colored (in the sense of being equipped with color ). Unaffected by most chemicals, it is attacked almost exclusively by 'aqua regia , by cyanide ion and mercury . It is found in its natural state in the form of nuggets , flakes and grains in rocks and alluvial deposits . It is used for minting coins and a monetary standard for many nations. It is also used in dentistry , jewelry and industrial electronics . Its ISO code as a currency is XAU . Gold has changed over time as the meaning of a symbol of purity, value and loyalty.