And if splitting atom releases energy, why haven’t these energy break from their atom themselves? Isn’t that means the force that bind the atoms are bigger than the energy released?
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To make a bomb you need the nuclear reactions happening really fast, before the bomb has a chance to fully blow up. It’s really hard to get that much fissile material to be unreacting in one moment, but then fully reacting in the next, without just blowing itself apart before it has a chance to react very much.
That’s why bombs today are really complicated. They start with a regular bomb that has the nuclear material at the center of the bomb. The outer bomb compresses the fissile material inside, and that compression makes all of the material supercritical at the same time. Add some neutrons to kick it off, and this is what gives us the nuclear explosion.
We actually see evidence of natural uranium reactions in some uranium ore deposits. Like geysers, water would carry just enough material to cause them to briefly react and generate some heat but because you don’t have enough of it in one place, it doesn’t explode.
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