On the chemical formula of nickel (II) acetate
The study of the chemical formula of nickel (II) acetate is a priority for scholars. To understand its formula, the first thing to know is the characteristics of nickel (II) ion and acetate ion.

Nickel (II) often shows + 2 valence in chemical reactions because of its electron arrangement. The chemical symbol of acetate ion is $CH_3COO ^ - $, which shows -1 valence.

According to the rule that the sum of positive and negative valence algebras in the compound is zero, in order to combine nickel (II) with acetate ion to form a stable compound, diacetate ion needs to be matched with one nickel (II) ion. Therefore, the chemical formula of nickel (II) acetate should be $Ni (CH_3COO) _2 $.

From this point of view, it is clear that the valence state of chemical elements, in accordance with the rules of valence, can obtain the exact chemical formula of the compound. This is the basis of chemical study and the path to explore the mystery of matter.