The positively charged ions will be attracted to the negatively charged electrode. So a lot of the sodium ions will move to the left side next to this negatively charged electrode. Likewise, the negatively charged ions will move towards a positively charged electrode. So all the corridions will collect next to the on the right side. So anytime this positively charged sodium ion hits this negatively charged electrode, a transfer of electrons will occur. So a sodium ion will gain electrons, and that means it's reduced.