Question

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which of these materials have virtually no free electrons in the outer layer?
pvc.
air.
ceramic.
glass.
aluminium.
ok

Explanation:

Materials like glass, ceramic, air, and PVC are insulators. Insulators have very few or virtually no free electrons in their outer layers as their electrons are tightly bound. In contrast, aluminum is a metal (conductor) with free electrons for electrical conduction.

Answer:

Glass, Ceramic, Air, PVC.