Such stacked orbits means that the electrons are held more firmly in orbit and we see a decrease in reactivity across the periodic table as electrons are added to each consecutive elements. If not for the Lorentz's force, each additional electron should be more readily removed from the atom and thus makes the atom more reactive. The existence of \(B\) orbit and the resulting stacked orbits provide an explanation for the increase in stability across the periodic table.
The nucleus is not involved in this stability.
