Differentiate between nuclear fission and nuclear fusion. Give one example for each with nuclear reaction.

Nuclear fission is the decay of a heavy nucleus into two or more intermediate mass fragments, whereas in nuclear fusion light nuclei fuse into a heavier nucleus.

Nuclear fission: $\displaystyle { }_{0}^{1} \mathrm{n}+{ }_{92}^{235} \mathrm{U} \rightarrow{ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+3{ }_{0}^{1} \mathrm{n}$

Nuclear fusion: $\displaystyle { }_{1}^{1} \mathrm{H}+{ }_{1}^{1} \mathrm{H} \rightarrow{ }_{1}^{2} H+e^{+}+\nu+Q$