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Gold is a chemical element with the symbol Au and the atomic number 79; It is thus one of the few elements with a high atomic number that is naturally available at the same time. It is found in nature in the form of a metal with a reddish-yellow color, and its density is high, and it is ductile and malleable. Gold is chemically classified as a transition metal and within the eleventh group elements of the periodic table. It is also classified among the noble metals, as it is not affected by most common acids, except in aqua regia, which is a mixture of nitric acid and hydrochloric acid..

Gold is found in its reservoirs in its free elemental form, sometimes in the form of pieces or granules inside rocks, or in the form of veins in the ground,

or in silt at the bottom of rivers. In general, gold is a relatively rare metal; It is sometimes found as a solid solution with silver metal in the electrum alloy; It also forms natural alloys with copper and palladium; In addition to forming an amalgam with mercury.