How would you Balance the Following Equation Mg(s) + O2(g) → MgO(s)

Answer: As Because magnesium (Mg) does have a valency of +2 and oxygen (O) does have -2 as valency, the ratio is 1:1, and magnesium oxide is denoted as MgO. Each element’s atom counts on the reactant as well as the product sides must be the same. That is the fundamental principle of equation balancing.