Copper, a native metal found in ores, is the principal metal in bronze and brass. It is a reddish metal with a density of 8920 kg m−3. All of copper’s compounds tend to be brightly colored: for example, copper in hemocyanin imparts a blue color to blood of mollusks and crustaceans. Copper has three oxidation states, with electronic configurations of Cu0([Ar]3d104s1), Cu+([Ar]3d10), and Cu2+([Ar]3d9). Cu0 does not react with aqueous hydrochloric or sulfuric acids, but is soluble in concentrated...

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