Thus, if you split a nucleus that is much larger than iron into smaller fragments, you will release energy because the smaller fragments are at a lower energy than the original nucleus. It turns out that the most tightly bound atomic nuclei are around the size of iron-56. If a nuclear reaction produces nuclei that are more tightly bound than the originals, then the excess energy will be released. The key is in how tightly the nucleons are held together in a nucleus. Nuclear fission is a process in which a nucleus splits into two smaller nuclei. Nuclear fusion is a process in which two nuclei join to form a larger nucleus. o Nuclear fusion is the joining together of light nuclei.Fusion and fission are similar in that they both release large amounts of energy.
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