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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Verified by ExpertsThe correct answer is:
A
In sodium chloride the 
and 
ions both have noble gas electron configuration corresponding to completely filled bands. Since the bands do not overlap, there must be a gap between the filled bands and the empty bands above them, so NaCl is an insulator.
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