What is nuclear fission?

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Question

(A) Nuclear fission is a nuclear reaction in which the nucleus of a heavy atom,such as $U^{235}$ or $Pu^{239}$,splits into two or more smaller,lighter

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The process of splitting a heavy nucleus into two lighter nuclei.

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(A) Nuclear fission is a nuclear reaction in which the nucleus of a heavy atom,such as $U^{235}$ or $Pu^{239}$,splits into two or more smaller,lighter nuclei (fission fragments) upon bombardment by a neutron. This process is accompanied by the release of a large amount of energy and the emission of additional neutrons. The mass of the resulting products is slightly less than the mass of the original nucleus,and this 'mass defect' is converted into energy according to Einstein's mass-energy equivalence principle,$E = \Delta m c^2$.

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