Question

distinguish between conductors,insulators and semiconductors based on the band theory of solids
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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:

Classification of Metals, Semiconductors, and Insulators. In case of metallic conductors, conduction band overlaps on the electrons in the valence band. In insulators, there is a large gap between both these bands. ... Semiconductors have a small gap between both these bands.