Final answer:
Nuclear fusion involves the fusion of two light atomic nuclei to form a heavier nucleus, releasing energy. An example is the fusion of hydrogen atoms to form helium.
Explanation:
Nuclear fusion is the process where two light atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy. One example of fusion is when two hydrogen atoms combine to form helium in the Sun's core. This reaction produces significant energy due to the mass defect.
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