Final answer:
Nuclear fission involves heavy nuclei splitting into lighter, more stable nuclei, releasing energy in the process.
Explanation:
Nuclear fission is the process by which heavy nuclei split into lighter and more stable nuclei, releasing tremendous amounts of energy in the process. For example, when uranium-235 is hit with a slow neutron, it absorbs it, becomes unstable, and splits into two medium-mass nuclei, releasing energy and more neutrons. The mass lost during fission is converted into energy.
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