Question

What are energy bands? How are these formed?
Distinguish between a conductor, insulator and a
semiconductor on the basis of energy band diagram.​

Answer 1

Answer:

In insulators the electrons in the valence band are separated by a large gap from the conduction band, in conductors like metals the valence band overlaps the conduction band, and in semiconductors there is a small enough gap between the valence and conduction bands that thermal or other excitations can bridge the gap

Explanation:

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Answer 2

Explanation:

Band theory is introduced in order to account for some properties of semiconductors. Have you seen any crystal stone? We know that in an atom there are electrons and some amount of energy in their definite energy levels.

A large number of atoms in a crystal stone is closer to each other and more those electrons interact with themselves. The energy level of electrons in their shell is only caused because of the modification in their energy levels. The most important feature of Energy Bands is that the energy states for electrons are continuous in varied ranges. Thus, we can say that the energy level of an atom vary in valence bands and in conduction bands.

In insulators the electrons in the valence band are separated by a large gap from the conduction band, in conductors like metals the valence band overlaps the conduction band, and in semiconductors there is a small enough gap between the valence and conduction bands that thermal or other excitations can bridge the gap.