Metals have such an electronic configuration which make them able to conduct electricity. In the outer most shell of a metallic atom, there are lone pair(s) of electrons. When a metallic atom is exposed to any form of energy like electricity, they jump from their original shell to the shell of higher energy. In this way lone pairs find vacant spaces for electrons in other atomic shells and jump from one shell to the other. As long as electricity is transferred the electrons keep on moving and this transfer of energy because of the flow of electrons is known as electricity.
