The following correctly applies to balancing nuclear equations.
"The sums of the mass numbers of the products and reactants must be equal."

Question

Quizplus · Accepted Answer

This statement is true. The mass number of an atom is the sum of its protons and neutrons. In a nuclear equation, the number of protons and neutrons in the reactants must be equal to the number of protons and neutrons in the products, in order to conserve mass.

The Following Correctly Applies to Balancing Nuclear Equations