Question

Why is nuclear fission reaction considered better?

Answer 1

The key to why some atoms split and release energy while others fuse to do the same lies in how tightly the protons and neutrons are held together. If a nuclear reaction produces nuclei that are more tightly bound than the originals then energywill be produced by fusion, and for fissionthe opposite is true.
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Answer 2

If a nuclear reactionproduces nuclei that are more tightly bound than the originals then energywill be produced by fusion, and forfission the opposite is true.
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