Here's why:

* Potassium (K) is in group 1 of the periodic table, making it a +1 cation (K⁺).

* Chlorine (Cl) is in group 17 of the periodic table, making it a -1 anion (Cl⁻).

To form a neutral compound, one potassium ion (K⁺) combines with one chloride ion (Cl⁻), resulting in the formula KCl.