Copper belongs to the Ⅰ B group in the periodic table, with the atomic weight of 63.546, belonging to the pro-sulfur element.
Copper is purple-red metal, density 8.96 grams/cm 3, Melting point 1083.4 ℃, boiling point 2,567 ℃, specific heat (25 ℃) 0.385J/g, MO hardness of 3, with good self-willed, ductility, and softness, easy forging and calendering, can be pressed into thin copper foil can also be rolled into thin copper wire.
Its thermal conductivity and conductivity are second only to silver in all metals.
Copper is not easily oxidized in dry air, but in moist air containing CO2, a layer of toxic alkaline copper carbonate (patina) is readily generated, which protects copper from corrosion. Copper insoluble in hydrochloric acid and dilute sulfuric acids, but soluble in oxidizing nitric aci