Why do we use uranium and plutonium for nuclear weapons and reactions?

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I would think that neutrons can break up any nucleus apart. Why not just use aluminium or iron. Is it because of E=mc^2 ? Greater mass equals greater energy? Would a bomb made of another material be less radioactive?
TIA

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Anonymous 0 Comments

Everyone knows that opposites attract, so why are all the nuclei made of a big clump of positive protons and neutral neutrons? There are other forces that take over when protons are close together that makes the nucleus stable. But if you stack too many protons, the other forces start to fight back and the nucleus becomes less stable, and easier to break apart. The chain reaction that is required will never happen if the nuclei are too stable.