Question

why electricity couldn't flow through diamond?

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Answer 1

Answer:

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In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won't be flow of electrons That is the reason behind diamond are bad conductor electricity.

Answer 2

Answer:

Carbon element is a bad conductor of electricity. Diamond is composed of carbon, thus it does not allow it to go through it.