Today, I have asked for the chemical formula of potassium fluoride. To find the chemical formula of a chemical, it is necessary to specify the ratio of its constituent elements and the number of atoms.

For potassium, the chemical symbol is K, and its common valence is + 1. For fluoride, the chemical symbol is F, and the common valence is -1.

To form a stable compound, the algebra sum of positive and negative valence must be zero. When potassium is combined with fluoride, according to the valence rule, a potassium atom is combined with a fluorine atom to satisfy this condition.

Therefore, the chemical formula of potassium fluoride is KF.