It all comes down to Einstein’s famous equation that states that E=mc^(2) in other words if you convert mass into energy you get a *huge* amount of energy.
The thing about nuclear fission reactions when you split a heavy nucleus into smaller nuclei the sum of the mass of the fission products is *less* than the mass of the original nucleus. Mass itself has been destroyed and the amount of energy released is huge. The total number of protons remains the same but neutrons is less.
The same goes for fusion reactions, you smack some hydrogen atoms together hard enough they can fuse into a single helium atom. It’s the same thing again, the number of protons remains the same but neutrons get converted into energy. Lots of energy.
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