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Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.

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Answered by GPT-5 mini AI
Nuclei split apart.

In a fission reactor, heavy atomic nuclei (e.g., U-235) absorb a neutron and split into lighter nuclei, releasing energy and additional neutrons that sustain a chain reaction.