A balanced redox equation must have which of the following: I. The same number of each type of atom on both sides of the equation II. The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction III. The same total charge of all ionic species on both sides of the reaction IV. H 20 present as a product or a reactant O I, II, and III I and 11 I, III, and IV O I, II, III, and IV O III and IV