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Copper : ウィキペディア英語版
Copper


Copper is a chemical element with symbol Cu (from (ラテン語:cuprum)) and atomic number 29. It is a soft, malleable and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a reddish-orange color. It is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys.
The metal and its alloys have been used for thousands of years. In the Roman era, copper was principally mined on Cyprus, the origin of the name of the metal from ''aes сyprium'' (metal of Cyprus), later corrupted to ''сuprum'', from which the words ''copper'' (English), ''cuivre'' (French), ''Koper'' (Dutch) and ''Kupfer'' (German) are all derived.〔''Encyclopaedia Britannica'', 11th ed., vol. 7, p. 102.〕 Its compounds are commonly encountered as copper(II) salts, which often impart blue or green colors to minerals such as azurite, malachite and turquoise and have been widely used historically as pigments. Architectural structures built with copper corrode to give green verdigris (or patina). Decorative art prominently features copper, both by itself and in the form of pigments.
Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase. In molluscs and crustacea copper is a constituent of the blood pigment hemocyanin, which is replaced by the iron-complexed hemoglobin in fish and other vertebrates. The main areas where copper is found in humans are liver, muscle and bone. Copper compounds are used as bacteriostatic substances, fungicides, and wood preservatives.
==Characteristics==


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