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Copper - Introduction
copper (Cuprum) is a metallic element and a transition element, the chemical symbol Cu, English copper, atomic number 29. Pure copper is a soft metal, the surface is just cut red orange with metallic luster, the elemental is purple. Good ductility, high thermal and electrical conductivity, so in cables and electrical and electronic components are the most commonly used materials, can also be used as building materials, can be composed of many kinds of alloys. Copper alloys have excellent mechanical properties and very low resistivity, the most important of which are bronze and brass. In addition, copper is also a durable metal that can be recycled many times without damaging its mechanical properties.
Bivalent copper salts are the most common copper compounds, their hydrated ions often appear blue, while chlorine ligands appear green, and are the source of the color of minerals such as azurite and turquoise, which were widely used as pigments throughout history. Corrosion of copper building structures will produce patina (basic copper carbonate). Art deco mainly uses copper and copper-containing pigments.
Copper was one of the earliest metals used by man. As early as prehistoric times, people began to mine open pit copper and use the copper to make weapons, tools and other utensils, and the use of copper had a profound impact on the progress of early human civilization. Copper is a metal found in the Earth's crust and oceans. The content of copper in the crust is about 0.01%, and in individual copper deposits, the content of copper can reach 3% to 5%. Copper in nature, most of the compound, copper ore exists.
The activity of copper is weak, and the reaction of iron with copper sulfate can replace copper. Copper is insoluble in non-oxidizing acids.[Plastic dryer encyclopedia]
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