Question

Exception in non metals in the case of bad conductor of electricity.

Answer 1

GRAPHITE is a type of non conductor which is a good conductor of electricity. Graphite has hexagonal layered 3d structure and these layer slide over each other such that there is presence iof free electron as the molecules of graphite are not tightly arranged so there is presence of free electron which enables Conduction of Electricity and make it a good conductor of ELECTRICITY.
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- AK

Answer 2

To become conductor in solid phase require free electrons. Non-metals do not have any free electrons therefore unable to conduct heat and electricity.