Copper is a transition metal element with the chemical symbol Cu and atomic number 29. Copper is one of the earliest metals used by humans. As early as prehistoric times, people began to mine open-pit copper mines and use the copper they obtained to make weapons, tools and other utensils. Pure copper is a soft metal with a purple-red color. It has good ductility, thermal conductivity and electrical conductivity. Therefore, it is widely used in cables and electrical, electronic components, building materials and alloys.
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