Answer:
It involves the combining of nuclei.
Step-by-step explanation:
The two common nuclear reactions are
a) Nuclear fission : which involves breaking of a larger nucleus by sub atomic particles which generate some more sub atomic particles and the reaction continues as chain reaction.
The fission also results in formation of smaller daughter nuclei.
Nuclear power plants work on this reaction.
b) Nuclear fusion is combining of two nuclei to give one bigger nucleus.
This this involves combining of nuclei.