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Gold, element Au, was one of the first known metals. The gold standard
defines the world's currency system, whereby money represents a value in
gold.

Gold is an extraordinary and rare precious metal, with an unmatched
combination of chemical and physical properties. It is the only yellow metal
and the name gold derives from the Old English word for yellow, 'Geolu'.

Gold is the most non-reactive of all metals and it does not oxidize under
ordinary conditions, meaning that it will never rust and never tarnish. Gold's
physical properties of high electrical conductivity and chemical inertness
make it an excellent and reliable conductor, particularly in harsh
environments, where temperatures can range from -55°C to 200°C. No other
metal is as malleable as gold. A single ounce of the metal can be drawn into
a wire five miles long. Gold is also an excellent conductor of thermal energy.
Due to all these specialties, gold is used in various other industrial
applications along with jewelry manufacturing.