Fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy (option 1).
Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
On the other hand, nuclear fusion is the combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy.
Therefore, fission nuclear reactions differ from fusion nuclear reactions because fission reactions involve the conversion of matter into energy.
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