Sodium chloride is normal salt, and potassium chloride is another salt. In general, chlorine is missing one electron from its full configuration, while the fir

Sodium chloride is normal salt, and potassium chloride is another salt. In general, chlorine is missing one electron from its full configuration, while the first column has a lonely electron in its outermost S-orbital — so they’re pretty happy to do a dance and make a molecule. (Which is why HCl is also a thing.)