Question

why insulator does not allows electron throw it?​

Answer 1

Answer:

Insulators are materials that have just the opposite effect on the flow of electrons. They do not let electrons flow very easily from one atom to another.

Answer 2

Answer:

In conductive materials, the outer electrons in each atom can easily come or go and are called free electrons. In insulating materials, the outer electrons are not so free to move. ... It is typically formed by charge separation by contact and separation of dissimilar materials.