Explanation:
A reaction in which a large atomic nuclei splits into two small nuclei along with release of energy is known as a nuclear fission reaction.
For example, [tex]^{235}_{92}U + ^{1}_{0}n \rightarrow ^{92}Kr + ^{141}Ba + 3^{1}_{0}n[/tex]
On the other hand a nuclear reaction in which two small nuclei combine together to result in the formation of a large nuclei is known as a nuclear fusion reaction.
Thus, we can conclude that the given diagram represents a nuclear fission reaction.
