Why are the observed energy changes for nuclear processes so much larger than the energy changes for chemical and physical processes?

The observed energy changes for nuclear processes are much larger than those for chemical and physical processes because nuclear processes involve the rearrangement of nucleons within the nucleus, which is governed by the strong nuclear force. This force is much stronger than the electromagnetic force responsible for chemical and physical phenomena. As a result, nuclear processes have energy changes on the scale of mega-electronvolts (MeV) per reaction, while chemical processes involve energy changes on the scale of electronvolts (eV) per reaction, and physical processes typically involve even smaller energy changes. This difference in energy scale has practical implications, such as the potential for nuclear energy to produce significantly more energy from a small amount of fuel compared to conventional chemical processes.