Physics - Semiconductors Question with Solution | TestHub

In good conductors, the valence band and the conduction band overlap each other. There is no forbidden energy gap between them.

Because of this overlapping, a large number of free electrons are available for conduction at room temperature. The concept of holes as charge carriers arises in semiconductors where an electron leaves a vacancy in the valence band after crossing the energy gap. Since there is no band gap in conductors, the current is entirely due to the flow of free electrons, and there is no hole current.

Answer: have overlapping valence and conduction bands.