Is the number of total atoms on the left side of a balanced equation always equal to the number total atoms on the right side of the equation

Yes, it is always the same

Explanation:

The total number of atoms on the left side of a balanced equation is always equal to the total number of atoms on the right side of the equation. The above statement defines a balanced equation.The law of conservation of mass in chemical equations requires that the equation is balanced. For example; a combustion reaction;

      C₄H₈ + O₂ → CO₂ + H₂O - The reaction is not balanced and therefore does not obey the law of conservation of mass.

However, the equation can be balanced to obey the law.That is; C₄H₈ + 6O₂ → 4CO₂ + 4H₂OThe equation is balanced by ensuring the total number of atoms on the left side is equal to the total number of atoms on the right.

Mgo2 is the oxidation state of manganese oxide