A good conductor contains many what?

The correct answer is that a good conductor contains many free electrons. This is primarily because conductors, such as metals, have a unique atomic structure where some of their electrons are not tightly bound to their atoms. These free electrons can move easily throughout the material, allowing for the efficient transfer of electric charge. When a voltage is applied across a conductor, these free electrons can flow in response to the electric field, creating an electric current.

This property is what differentiates conductors from insulators, which do not have free-moving charges and therefore do not conduct electricity well. While charged particles can refer to various entities, in the context of electrical conduction, it’s the mobility of free electrons in conductors that is specifically relevant, rather than the presence of other charged entities. Atomic nuclei are also present in conductors but are not responsible for conductivity; rather, they provide structure and do not move freely like electrons.