If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be a(n

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It will be an insulator.

If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be an insulator.

What is insulator?

An insulator is a material in which electric current does not flow freely.

The electrons are tightly bound to each other that they do not move easily.

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