CENTAMIN TABLETS

63.546±0.00363.546±0.003(abridged) 1st: 745.5 kJ/mol2nd: 1957.9 kJ/mol3rd: 3555 kJ/mol(more) ve viewtalkedit Copperis achemical element; it hassymbolCu(fromLatincuprum) andatomic number29. It is a soft, malleable, andductilemetal with very highthermalandelectrical conductivity. A freshly exposed surface of pure copper has apinkish-orange color. Copper is used as a conductor of heat and electricity, as abuilding material, and as a constituent of various metalalloys, such assterling silverused injewelry,cupronickelused to make marine hardware andcoins, andconstantanused instrain gaugesandthermocouplesfor temperature measurement. Copper is one of the fewnative metals, meaning metals that occur naturally in a directly usable, unalloyed metallic form. This led to very early human use in several regions, fromc.8000 BC. Thousands of years later, it was the first metal to besmeltedfrom sulfide ores,c.5000 BC; the first metal to be cast into a shape in a mold,c.4000 BC; and the first metal to be purposely alloyed with another metal,tin, to createbronze,c.3500 BC. Commonly encountered compounds are copper(II) salts, which often impart blue or green colors to such minerals asazurite,malachite, andturquoise, and have been used widely and historically as pigments. Copper used in buildings, usually for roofing, oxidizes to form a greenpatinaof compounds calledverdigris. Copper is sometimes used indecorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used asbacteriostatic agents,fungicides, andwood preservatives. Copper is essential to allaerobic organisms. It is particularly associated with oxygen metabolism. For example, it is found in the respiratory enzyme complexcytochrome c oxidase, in the oxygen carryinghemocyanin, and in severalhydroxylases.Adult humans contain between 1.4 and 2.1 mg of copper per kilogram of body weight.