How does conductivity work. Normally we talk about 'free' electrons carrying charge through a lattice. An electron puts electrostatic pressure on the lattice by moving into one end of the lattice. Another electron moves out of the lattice near the 'load'.
Free electrons and lattices with holes have been observed to conduct. More well balanced material does not. I want to explore why. When an insulator is injected with a hot electron it gives up an electron quickly.
Electrons propagate their influence in a conductor at very high speeds. The wave of electrical influence propagates at a fraction of the speed of light.
Atoms and molecules that are electrically balanced, bonded and are not prone to ionization make poor conductors. These electrons may slow the drift of charge such that it gets reflected back to the source or the generator.