In terms of band theory, what is the difference (i) between a conductor and an insulator ?(ii ) between a conductor and a semiconductor ?

In terms of band theory, what is the difference (i) between a conducto

1.	In terms of band theory, what is the difference (i) between a conductor and an insulator ?(ii ) between a conductor and a semiconductor ?
Answer» Solution :(i)The ENERGY gap between the VALENCE band and conduction band in an insulator is very large whereas in a conductor, the energy gap is very small or there is OVERLAPPING between Valence band and conduction band. (II) In conductor, there is very small energy gap or there is overlapping between valence band and conduction band but in a semiconductor, there is always a small energy gap between them