Sodium chloride solution can be using electrolysis.

A sodium ion gains an [?] to become sodium . This happens at the [?]. Because of this, we say that sodium is a cation.

The chloride ion loses an electron to become a atom. It then bonds [?] with another chlorine atom to become a chlorine . This happens at the anode, so we call the chloride ion the .

Sodium is much more than hydrogen, so the sodium stays in solution, and gas is given off at the cathode.