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Copper is a ductile and malleable base metal that is valued for its high thermal and electrical conductivity. Easily identifiable because of its iridescent, golden red color, copper and its alloys, have been used by humans for thousands of years.
Metals. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.etals. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.