Some materials have electrons that are tightly bound to the nucleus and are not free to travel within the substance. These materials are called .............

conductors

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insulators

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semiconductors

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none of these

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Solution

The correct option is B insulators
Some materials have electrons that are tightly bound to the nucleus and are not free to travel within the substance. These materials are called insulators.
An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field.

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