Because there are no protons in orbit around the nucleus of an atom, only electrons orbit the nucleus.
Electrons flow down a wire when there is a negative potential on one side, which repels the electrons and causes them to leap from their orbit in one atom and send it to the next atom.
Electrons flow down a wire when there is a negative potential on one side, which repels the electrons and causes them to leap from their orbit in one atom and send it to the next atom.