Gold is a chemical element with symbol Au (from its Latin name of gold) and nuclear number 79. It is very popular precious metal which was used earlier as money, a store of value and in jewelry from the beginning of the registered history. Metal occurs as nuggets or grains in rocks, underground "veins" and in alluvial deposits. It is one of stamping metals. Gold is dense, soft, shining, and for today represents the most obedient and pliable known substance. Pure gold has a bright yellow colour which traditionally consider the attractive.



Gold has generated the basis for the gold standard used before crash of Wooden system Bretton. The code of currency of the International Organization on gold Standardization in ingots - XAU.

Modern industrial use includes treatment of a teeth and electronics where gold has traditionally found use because of its good resistance of oxidising corrosion.



In chemical value gold - metal of transition also can generate trivalent and univalent cations on solvation. Gold does not react with the majority of chemicals, but is exposed to influence by chlorine, fluorine, imperial vodka and cyanide. Gold breaks up in mercury, forming mix alloys, but does not react with it. Gold is insoluble in nitric acid which will terminate silver and the basic components of an alloy, and it is the basis of gold technics of the clearing known, as "inquartation and division". Nitric acid was long used to confirm presence of gold at points, and it is an origin of colloquial term "touchstone", addressing to the test of the gold standard for original value.