(The number indicates the quantity of protons and neutrons in the atom's nucleus.) (sciencenews.org)
A decade later, physicists devised a theory for the strong nuclear force, which binds protons and neutrons in the atomic nucleus. (discovermagazine.com)
They also don't feel a powerful force that operates on tiny scales, known simply as the strong force, which binds protons and neutrons together in an atom's nucleus. (discovermagazine.com)