Answer: The given statement is true.
Explanation:
When two small nuclei combine together and result in the formation of a larger nuclei then this process is known as nuclear fusion.
For example, [tex]^{2}_{1}H + ^{3}_{1}H \rightarrow ^{4}_{2}He + ^{1}_{0}n[/tex]
Therefore, the statement when two hydrogen nuclei combine to form one helium nucleus, nuclear fusion has taken place, is true.
