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What do you mean by valence,conduction and forbidden bands?

Answer» <p>In insulators theelectronsin thevalence bandare separated by a largegapfrom theconduction band, in conductors like metals thevalence bandoverlaps theconduction band, and in semiconductors there is a small enoughgapbetween thevalenceandconduction bandsthat thermal or other excitations can bridge thegap.</p>


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