How does copper conduct electricity?
It could also be said that some of the electrons of the copper are at Fermi energy levels that are in what is said to be the “conduction band” for copper. The conduction band is the minimum energy level necessary for electrons of a given material to be in to support conduction in that material. If the Fermi energy levels of the valence band electrons is up in the conduction band, then that material is a conductor. Copper is this way.
