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(D) In solid-state physics,materials are classified based on their energy band gaps.Metals have overlapping valence and conduction bands,meaning the b

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Insulators

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(D) In solid-state physics,materials are classified based on their energy band gaps.Metals have overlapping valence and conduction bands,meaning the band gap is effectively $0 eV$.Semiconductors have a small band gap,typically around $1 eV$ to $3 eV$.Insulators have a very large energy band gap,which is generally greater than $3 eV$,preventing electron flow from the valence band to the conduction band under normal conditions.Therefore,insulators have the largest band gap among the given options.

The class of materials having the largest band gap in the following is

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