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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We should also note that when the uranium was made in a supernova explosion, billions of years ago, the uranium was roughly an equal mixture of U-238 and U-235. While this is enriched uranium, it is not highly enriched. So if you get a moderator like water for the neutrons, you can form a reactor or even an “out of control” reactor which boils away the moderator and stops and starts again, but you can’t assemble enough U-235 to make a prompt critical explosion which goes off in microseconds.
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