Copper is a metal. It is a good conductor of electricity and heat, has a high density, and is malleable and ductile.

Copper is a crystalline solid.

When copper and oxygen react, they combine to form copper(II) oxide. This chemical reaction involves the transfer of electrons from copper to oxygen, resulting in the formation of the compound CuO. Copper(II) oxide is a black solid.

copper oxide.......CuO

When copper is added to iodine, a reaction occurs in which the copper displaces the iodine from its compound forming copper iodide. This reaction is a single displacement reaction where the more reactive copper replaces the less reactive iodine in the compound. The chemical equation for this reaction is Cu + I2 → CuI