Question

The chemical formula of sodium chloride is NaCl. The chemical formula of zinc chloride is ZnCl2. Why is it so ?

Answer 1

because it is it's formula!!! and according to iupac every compound must be given a chemical formale
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Answer 2

Because I'm the chemical Formula is written by exchanging their valence on their respective formula

Since valency of na is 1 and Zn is 2 it is written in such a manner