Question
Define ‘nuclear fission’ Give an example.

Answer

The process of breaking (splitting) up of a heavier nucleus into two smaller nuclei with the release of a large amount of energy and a few neutrons are called 'nuclear fission'.
E.g. Nuclear fission of a uranium nucleus $\left( U ^{235}\right)$
$
92^{ U ^{235}}+{ }_0 n ^1 \rightarrow_{56} Ba ^{141}+{ }_{36} Kr ^{92}+{ }_{30} n ^1+ Q (\text { energy })
$

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