fission

Fission is a nuclear reaction where the nucleus of an atom splits into smaller parts, often releasing a significant amount of energy. This process typically occurs in heavy elements, like uranium or plutonium. When the nucleus splits, it can release neutrons, which may trigger further fission in nearby nuclei, leading to a chain reaction. Fission is the principle behind nuclear reactors, which generate electricity, and atomic bombs, which release massive energy in an explosive manner. The controlled process in reactors allows for energy production, while uncontrolled reactions lead to destruction.