Answer: The given statement is false.
Step-by-step explanation:
When two small atomic nuclei combine together to result in the formation of a large nuclei along with emission of energy is known as nuclear fusion.
For example,

Whereas in a nuclear fission a large nuclei splits into two or more small nuclei along with emission of energy.
For example,

Thus, we can conclude that the statement splitting apart of atomic nuclei is known as fusion, is false.