According to the context, its nucleus breaks apart is an event that occurs when an atom undergoes nuclear fission.
It is a reaction by which the nucleus of an atom is divided into two or more smaller nuclei, that is, the nucleus of an atom is split.
Through this reaction, large amounts of energy are obtained, emitting neutrons, gamma rays and large amounts of heat in the process.
Therefore, we can conclude that according to the context, its nucleus breaks apart is an event that occurs when an atom undergoes nuclear fission.
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Answer: Its nucleus releases energy.
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