Question

explain conductor semiconductor and insulator on the basis of Band theory of metals

Answer 1

the object which allows current to pass through them are called as conductors because of the free electrons.those which partially conducts current and semiconductors and which do not allow current to pass through them are called as insulators

Answer 2

Answer:

Conductors

In a conductor there are no band gaps between the valence and conduction bands. In some metals the conduction and valence bands partially overlap. This means that electrons can move freely between the valence band and the conduction band.

The conduction band is only partially filled. This means there are spaces for electrons to move into. When electrons for the valence band move into the conduction band they are free to move. This allows conduction.

Insulators

An insulator has a large gap between the valence band and the conduction band.

The valence band is full as no electrons can move up to the conduction band. As a result, the conduction band is empty.

Only the electrons in a conduction band can move easily, so because there aren't any electrons in an insulator's conduction band, the material can't conduct.

Semiconductors

In a semiconductor, the gap between the valence band and conduction band is smaller. At room temperature there is sufficient energy available to move some electrons from the valence band into the conduction band. This allows some conduction to take place.

An increase in temperature increases the conductivity of a semiconductor because more electrons will have enough energy to move into the conduction band.

Explanation: