it is a soft, yellow, corrosion-resistant element, the most malleable and ductile metal, A good thermal and electrical conductor, gold is generally alloyed to increase its strength, and it is used as an international monetary standard, in jewelry, for decoration, and as a plated coating on a wide variety of electrical and mechanical components.it is recognizable by its yellowish cast, is one of the oldest metals used by humans.
the atomic number of gold is 79, its atomic weight is 196.967; melting point 1,063.0°C; boiling point 2,966.0°C; specific gravity 19.32; valence 1, 3. The Latin name for gold, aurum is the source of the chemical symbol (Au).
About 65 percent of processed gold is used in the arts industry, mainly to make jewelry. Besides jewelry, gold is also used in the electrical, electronic, and ceramics industries. The remaining percentage of mined gold is used to make a type of ruby colored glass called purple of Cassius, which is applied to office building windows to reduce the heat in the summer, and to mirrors used in space and in electroscopy so that they reflect the infrared spectrum. These indicates gold precious substances.
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