Question

Distinguish with the help of diagrams metal conductors, insulators and semiconductors from each other.

Answer 1

Metal conductors	Insulators	Semiconductors
Metals are good conductors of electricity.	Insulators are nonconductors of electricity.	Semiconductors have conductivity that is intermediate between conductors and insulators.
In metal conductors, the conduction band is partially filled and there is no band gap or there is overlapping between the valence band and conduction band.	In insulators, the valence band and conduction band in insulators are separated by a large energy gap called the forbidden zone.	In semiconductors, the valence band is completely filled with electrons, and the conduction band is empty. However, the energy gap between the two bands is smaller than that in an insulator.