Question

Define nuclear fusion.

Answer 1

Nuclear fusion is the process in which two light nuclei combine to form a heavier nucleus, releasing a huge amount of energy.

Example: $${}_1^2\mathrm{H} + {}_1^3\mathrm{H} \rightarrow {}_2^4\mathrm{He} + {}_0^1\mathrm{n} + \text{energy}$$