Which of the following non-metals is a good conductor of electricity?

ADiamond
BGraphite
CSulphur
DWhite phosphorus

Answer: B

Graphite has one delocalised

π

electron per carbon, which can move within a layer, so it conducts. Diamond (all four electrons in sigma bonds), sulphur and white phosphorus are insulators.

Practice p-Block Elements: Groups 13 and 14 More on Carbon allotropes, oxides of carbon

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