The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy, is nuclear .

fission

Explanation:

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

Thus if a heavier nuclei is converted into two smaller nuclei, this is a nuclear fission reaction.

here are some of the ways in which chemical and nuclear reactions differ.

explanation: