So we'll have a separation of sodium and chloride in our liquid. Now, what happens when our sodium positively charged ion hits this negatively charged electron? Well, some of the electrons will transfer into our sodium molecule, and that means our sodium will be reduced. So this section is where reduction occurs. And that means by definition, it must be our cathode. Now, likewise, when these molecules or ions hit this little electrode, they give off some of these electrons, because electrons want to move from a negative charge to a positive charge.