Differences between fission and fusion are:
Fission
1. In a fission reaction, a heavy nucleus breaks up to form two lighter nuclei.
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2. Nuclear fission is a chain reaction,
3. Fission reactions are carried out by bombarding the heavy nuclei with neutrons.
4. Nuclear fission reactions have been controlled to generate electricity.
5. Nuclear fission produces a large amount of energy.
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Fusion
1. In a fusion reaction, two light nuclei combine to form a heavy nucleus.
2. Nuclear fusion is not a chain reaction.
3. Fusion reactions are carried out by heating the light atoms to an extremely high temperature.
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4. Nuclear fusion reactions have not been controlled so far.
5. The energy produced in a nuclear fusion reaction is much more than that produced during fission.