It allows electrons to transfer in this direction. So if they transfer this way, that means this metal obtains these electrons. So this metal or electrode forms a negative charge, while this electrode forms a positive charge, because electrons will be taken away from this electrode. So, since this develops a negative charge, let's see what happens with the portion that's immersed into our liquid. Well, we said some of the sodium molecules will be moving around, and since they are positively charged, they will be attracted to this negatively charged electrode. Likewise, these chloride atoms are negatively charged, so they will be attracted to this positively charged electrode.