According to the image in this question, the type of reaction shown is that of fission because nuclei are being split into smaller and smaller places.
What is nuclear fission?
Nuclear fission in radioactivity is the process whereby the nuclei of atoms split into smaller particles.
In the above diagram, an atom of uranium is labeled and its nucleus is shown to split into smaller particles in succession.
Therefore, the reaction exemplifies a nuclear fission because nuclei are being split into smaller and smaller places.
Learn more about fission at: https://brainly.com/question/2732120