_Mg +_Cl2 = _MgCl2 Blance the equation

The answer to your question is   1, 1, 1

Explanation:

Data

               Mg  +  Cl₂   ⇒   MgCl₂

To balance an equation just consider the Law of conservation of Energy. That states that matter can be neither created nor destroyed. This means that the mass of reactants is equal to the mass of the products.

              Mg  +  Cl₂  ⇒  MgCl₂

  Reactants       Elements     Products

          1               Magnesium      1

          2               Chlorine           2

This equation is balanced because the number of reactants is equal to the number of products.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)