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Why are covalent compounds insulators?

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For any conduction be it charge or heat carriers are required. For most substances elctrons serves this purpose i.e conductivity is directly proportional to availability of free electrons. read more

Covalent compounds tend to be good insulators - example include fiberglass and ceramic materials. This is because the electrons of the molecules are locked in place and resistent to movement; this tendency insulates the electricity flowing along around them from jumping across the material. read more

The electrons in the outermost shell of the covalent compounds are shared by the nearby atoms. As there are no free electrons (only at absolute zero) for conducting electricity, the covalent compounds are perfect insulators at absolute zero. As the temperature increases, some electrons move from valence band to conduction band. read more

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CHE Materials Chemistry & Catalysis : Solid State ...
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Further Research

Ionic and Covalent Bonds
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