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Nuclear fusion is when two nuclei join together and another different nucleus results. For example deuterium plus tritium (both hydrogen isotopes) fuse to give helium. The D nucleus is one proton and one neutron, the T nucleus is one proton and two neutrons. When they join the result is the He nucleus which has two protons and two neutrons, and so there is also a spare neutron ejected.

Fission occurs with large nuclei like U-235 and Pu-239, the nucleus just splits apart forming the nuclei of two lighter elements (the total number of protons has to equate before and after), and also releasing spare neutrons. One or more of these spare neutrons can then be captured by another U-235 or Pu-239 nucleus, so that a chain reaction can proceed.

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Q: Differentiate nuclear fusion from nuclear fission using diagram?
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