Pure sodium `(Na)` is a good conductor of electricity because the `3s` and `3p` atomic bands overlap to from a partially filled conduction band. By contrast the ionic sodium chloride `(NaCl)` crystal isA. InsulatorB. ConductorC. SemiconductorD. None of these

Pure sodium `(Na)` is a good conductor of electricity because the `3s`

1.	Pure sodium `(Na)` is a good conductor of electricity because the `3s` and `3p` atomic bands overlap to from a partially filled conduction band. By contrast the ionic sodium chloride `(NaCl)` crystal isA. InsulatorB. ConductorC. SemiconductorD. None of these
Answer» Correct Answer - A In sodium chloride the `Na^(+)` and `Cl^(-)` ions both have noble gas electron configuration corresponding to completely filled bands. Since the bands do not overlaps, there must be a gap between the filled bands and the empty bands above them, so `NaCl` in an insulator.

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Pure sodium `(Na)` is a good conductor of electricity because the `3s` and `3p` atomic bands overlap to from a partially filled conduction band. By contrast the ionic sodium chloride `(NaCl)` crystal isA. InsulatorB. ConductorC. SemiconductorD. None of these

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