Copper

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A copper disc (99.95% pure) made by continuous casting and etching.

Copper ( ) is a chemical element with the symbol Cu (from ) and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color. It is used as a conductor of heat and electricity, a building material, and a constituent of various metal alloys.

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