Pure sodium (Na) is a good conductor of elect | vedclass

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(A) In sodium chloride $(NaCl)$,the $Na^+$ and $Cl^-$ ions both have a stable noble gas electron configuration,which corresponds to completely filled

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Insulator

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(A) In sodium chloride $(NaCl)$,the $Na^+$ and $Cl^-$ ions both have a stable noble gas electron configuration,which corresponds to completely filled energy bands.Since these filled bands do not overlap with the empty conduction bands,there exists a large energy gap (forbidden energy gap) between the valence band and the conduction band.Due to this large energy gap,electrons cannot easily jump to the conduction band,making $NaCl$ an insulator.

Pure sodium $(Na)$ is a good conductor of electricity because the $3s$ and $3p$ atomic bands overlap to form a partially filled conduction band. By contrast,the ionic sodium chloride $(NaCl)$ crystal is:

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