Nowadays, the chemical formula of aluminum and fluoride needs to be studied in detail. For aluminum, the metal element is also a metal element, and its common valence is + 3. In fluoride, the valence of fluorine is often -1.

According to the rule that the sum of positive and negative valence algebras in the compound is zero, if you want to make aluminum and fluoride become electrically neutral after combining, you need 1 aluminum atom to combine with 3 fluorine atoms, so the sum of positive and negative valence algebras is ：\(( + 3) + (-1) \ times3 = 0\). Therefore, the chemical formula of aluminum and fluoride is\ (AlF_ {3}\), which accurately expresses the composition ratio of aluminum and fluoride, which is crucial in chemical study and related practice.