Question

what is nuclear fusion? the splitting of a large nucleus into smaller nuclei the decay of a radioactive element the combination of small nuclei to form a larger nucleus the process of electrons orbiting a nucleus

Explanation:

Nuclear fusion is the process where small atomic nuclei combine to form a larger nucleus, releasing a large amount of energy. The first option describes nuclear fission. The second option is radioactive decay. The fourth option is related to atomic structure, not nuclear fusion.

Answer:

The combination of small nuclei to form a larger nucleus