What are free electrons in the conduction?

What are the free electrons in the conduction? Free electrons are not tied to any atoms or molecules and are free to move under the influence of an electric field. In metals having atoms of Al, Cu, etc the free electrons are located in the outer valence orbit. These free electrons form covalent bonds that ionize the atoms. When an external electric field is applied by the voltage source the free electrons move and there is conduction.

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