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Nuclear fission is a process in which a heavy atomic nucleus, such as uranium-235 or plutonium-239, splits into two or more lighter nuclei along with the release of a large amount of energy and several neutrons. This splitting occurs when the nucleus absorbs a neutron and becomes unstable. For example, when a uranium-235 nucleus captures a neutron, it forms an excited uranium-236 nucleus, which then splits into two smaller nuclei, such as barium-141 and krypton-92, releasing energy of approximately 200 MeV and 2–3 free neutrons. The energy released comes from the _______ ____ ___ ____ ______ _________ __________ _______ ________ _________ _____.
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