Name : Gold Symbol : Au Atomic # : 79 Atom weight: 196.967 Melting P. : 1064.4 Boiling P. : 2808 Oxidation : +1, +3 Pronounced : GOLD From : Anglo-Saxon in origin; Symbol, Au, taken from the Latin name, aurum, "shining dawn" Identified : Prehistoric origin Appearance : Soft, malleable, yellow metal Note : There is enough gold in this planet to make a cube of metal 60 feet wide. [Properties] Gold has a very distinctive yellow color. It is incredibly malleable and ductile - a single ounce of pure gold can be beaten out to a sheet that is about 300 feet square. It is about as heavy as ordinary lead and, like lead, pure gold is easily cut with a knife. Few elements react readily with gold under normal environmental conditions. This accounts for why most gold is mined as flakes and nuggets of the yellow metal itself. It does react somewhat with chlorine gas and aqua regia (a mixture of hydrochloric and nitric acids). Gold is a very good conductor of electricity; because it does not normally corrode, it is often used as a plating material for electrical connectors. Gold is also a good reflector of heat-carrying infrared radiation, so a thin film of gold is applied to the glass in skyscrapers in order to reduce the amount of internal heating from sunlight. The purity of gold is measured in units of karat. Pure gold is rated at 24 karat. An alloy that is 50% gold is 12 karat. The amount of gold in common jewelry is reckoned at 18 karat, meaning that the percentage of gold is 18/24 times 100, or 75%.