Explanation:
A reaction in which large atomic nucleus of an atom splits into two small atomic nuclei is known as a nuclear fission reaction.
For example, [tex]^{14}_{7}N + ^{1}_{0}n \rightarrow ^{13}_{6}C + ^{1}_{1}H[/tex]
This reaction shows that nitrogen nucleus splits into a carbon and hydrogen nuclei.
On the other hand, a reaction in which two small nuclei combine together to result in the formation of a large nuclei is known as nuclear fusion reaction.
For example, [tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n + Energy[/tex]
Hence, we can conclude that in the given reaction mass number and atomic number of carbon is [tex]^{13}_{6}C[/tex].
