The distinction between conductors, insulators and semiconductors is largely concerned with\

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Professor PC Thomas Classes · Answer

For conductors the band gap energy (forbidden gap) is zero. Conduction band and valence band over lap. The extend of overlap is more in good conductors.\ For semiconductors the band gap energy is 1 to 3 eV .\ For insulators the band gap energy is more than 5 eV . Larger the band gap energy, better will be the insulating action.