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A chemical element, in the periodic table copper has the symbol Cu and atom number 29.

Copper is a reddish-coloured metal, with a high electrical and thermal conductivity. Copper is one of the metals discovered and used from the earliest times, as besides being found in various ores, it can actually be found in the metallic form (`Native copper') in some locations.

There are numerous alloys of copper - Brass is a copper/zinc alloy, and bronze is a copper/tin alloy.

 Copper oxide is green.