20. Because both sides of a chemical equation must balance, the mass of the must equal the mass of the___? A. atoms, chemicals
B. reactant(s), product

Must be negative.substance increases

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic