Question

multiple - choice question
what is true about the total mass number on the left side of the arrow and the right side of the arrow?
the total mass number on the right side is smaller than the mass number on the left side
the total mass number on the right equal the mass number on the left
the total mass number on the right side is larger than the mass number on the left side

Explanation:

In nuclear - chemical reactions, mass number is conserved. This means the sum of the mass numbers of the reactants (left - hand side of the arrow) is equal to the sum of the mass numbers of the products (right - hand side of the arrow).

Answer:

the total mass number on the right equal the mass number on the left