Barium (Ba) is + 2 valence, fluorine (F) is -1 valence. According to the principle that the sum of positive and negative valence algebras in compounds is zero, the chemical formula of barium fluoride is $BaF_ {2} $.

There are things today, and their properties are different. To understand its chemical formula, barium, the valence state is positive two, and the valence state of fluorine is negative one. According to the rule of positive and negative valence and zero, the formula is $BaF_ {2} $. This formula can also express its composition and structure, which is very important in chemistry. If this formula is understood, its properties and reactions can be seen.