In insulators (CB is conduction band and VB is valence band )

in insulatore (C.B. is conduction band and V.B. is a valence band)

In which of the solids semiconductors, conductors or insulators) do conduction band and valence band overlap ?

The conduction band overlaps with the valence band in

The conduction band and valence band in a good conductor

The electrons in the conduction band and valence band are respectivley called

Number of electrons = Number of holes in conduction band and valence band. So that solid is

Explain the formation of energy bands in solids and hence define conduction band and valence band.