Copper, with an atomic number of 29 in the periodic table, belongs to the first subgroup.
Copper is a kind of rose red metal, soft, with metallic luster, density of 8.92 g/cm³, melting point is 1083.5 ℃, boiling point is 2595 ℃, It has ductility, flexible, good strength. In terms of electrical conductivity and thermal conductivity, copper second only to silver. It can be hot and cold pressure processing, it has face-centered cubic lattice, copper and its compounds with non-magnetic. The vapor pressure of copper at the melting point is very small, so it is not easy to volatile at the temperature of the metallurgical process.
Liquid copper can dissolve some gas such as H2, O2, SO2, CO2, CO, and water vapor, dissolved gas on the mechanical properties and electrical conductivity of copper all have certain influence, pure copper with dry air at room temperature and wet air doesn't work, but in CO2 in wet air, the surface will produce green film CuCO3Cu(OH)2 is also called patina, it can be protect copper from corrosion. When copper is heated in the air to 185℃, it begins to react with oxygen, forming a layer of dark red copper oxide on the surface. Copper can be dissolved in nitric acid and sulfuric acid with oxidizer, copper can be dissolved in ammonia water, and can also be combined directly with oxygen, halogen and other elements.
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