Question

How do chemical equations illustrate that atoms are conserved?

Answer 1

Well, they do if the chemical equation is stoichiometrically balanced...

Explanation:

And what does `"stoichiometrically balanced"` mean? It means that for every reactant particle, there is a corresponding product, or for every gram of reactant there is a gram of product. Electronic charge is conserved AS WELL as mass...

See this old spray for more of the same.