Main Question or Discussion Point
It seems strange that a neutron wouldn't have a function within an atom other than obtain mass, a neutral charge, and stick to protons. Do neutrons have more gravity than protons?
To emphasize this point, without neutrons, the universe would not have any atoms except hydrogen.The neutron has a very important role in keeping the nucleus together. Neutrons contribute to the strong nuclear force (just like protons) that holds the nucleons (neutrons and protons) together against the electrostatic repulsion of the charge protons.