Splitting the uranium atom releases energy because you’re breaking the strong nuclear force, the force that holds protons and neutrons together in the nucleus. Imagine it’s really strong glue that holds lego bricks together.
We haven’t seen a nuclear explosion in natural ore because it has decayed into a stable isotope. This is because the glue is so strong that the bricks don’t want to break apart.
>And if splitting atom releases energy, why haven’t these energy break from their watom themselves?
When a nucleus decays energy is conserved by the emission of a particle and EM radiation.
>Isn’t that means the force that bind the atoms are bigger than the energy released?
Yes. You have basically described the strong nuclear force.
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