In a nuclear fission reaction:

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(C) Nuclear fission is a process in which a heavy nucleus (such as $U-235$) is bombarded by thermal neutrons (low-energy neutrons). Upon absorption of

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$A$ heavy nucleus bombarded by thermal neutrons breaks up.

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(C) Nuclear fission is a process in which a heavy nucleus (such as $U-235$) is bombarded by thermal neutrons (low-energy neutrons). Upon absorption of the neutron,the heavy nucleus becomes unstable and splits into two or more smaller,lighter nuclei,releasing a large amount of energy and additional neutrons. Therefore,the correct statement is that a heavy nucleus bombarded by thermal neutrons breaks up.

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