The atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but rubber does not conduct electricity?
Metals have more free electrons in their outer orbits compare to non-metallic materials. These free electrons can be easily moved by an electric field and they are involved in the conduction of electricity.
Copper is a metal and has free electrons, which are responsible for the flow of current and hence, conduct electricity.
Rubber, on the other hand, does not have free electrons and cannot conduct electricity
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