Answer:
The answer to your question is 1, 1, 1
Step-by-step 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.