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Out of SiO2(s), Si(s), NaCl(s) and Br2(I...

Out of `SiO_2(s), Si(s), NaCl(s)` and `Br_2(I)` which is best electrical conductor and why?

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Silicon is best conductor out of these because it is semiconductor i.e. less gap between conduction and valence band whereas others are insulators in solid state.
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