Electronic Cause of Potential Difference in the Simple Cell
Alex Reiter · Proceedings of the Oklahoma Academy of Science · 2015
If any metal be placed in any ionic solution in which it dissolves, because the negative solution ion already has its valence shell full of electrons. the dissolving metal leaves upon the metal plate its valence electrons 80 that the dissolved metal becomes a metallic positive ion so it may combine with the solution negative ion to form a molecule. This reaction leaves the metal plate with an ion charge upon it.