Nuclear fission has been defined as the splitting of an atomic nucleus. Thus, option A is correct.
An atom has been the smallest unit of matter. It has been comprised of a central positive nucleus and negative charged electrons revolving around the nucleus.
Nuclear fission
Fission has been defined as the splitting of an entity into multiple constituents. The splitting of atomic nucleus has been found to take place under the circumstances of temperature, pressure, and radiations.
The splitting of the atomic nucleus has been known as nuclear fission. Thus, option A is correct.
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