Question

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

Explanation:

Ceramic, glass, PVC, and air are all insulators. Insulators have very few free electrons in their outer layers as their electrons are tightly bound to the atoms. In contrast, aluminum is a metal and has a large number of free electrons in its outer layer which makes it a good conductor.

Answer:

Ceramic, Glass, PVC, Air.