The energy band gap is maximum in

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(C) The correct answer is $C$. In insulators,the valence electrons are tightly bound to the nucleus. At room temperature,the available thermal energy

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Insulators

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(C) The correct answer is $C$. In insulators,the valence electrons are tightly bound to the nucleus. At room temperature,the available thermal energy is insufficient to excite electrons from the valence band to the conduction band. The energy band gap in insulators is typically large,often greater than $3 \ eV$ (usually around $6 \ eV$),which prevents electrical conduction. In contrast,semiconductors have a small band gap (around $1 \ eV$),and metals have no band gap (the valence and conduction bands overlap).

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