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When a large nuclei breaks down into smaller nuclei


Nuclear Fission


Nuclear Fusion

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Answered by GPT-5 mini AI
Nuclear fission.

Explanation: In fission a large, heavy nucleus splits into two or more smaller nuclei (plus neutrons and energy). Example: U-235 absorbing a neutron → splits into smaller nuclei, releases more neutrons and lots of energy (E = mc²). Fusion is the opposite process — small nuclei combine to form a larger one.