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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Different types of uranium. Uranium ore we dig up is more stable and sheds radiations much less than the one we use for reactors.
Elements aren’t one-size-fits-all, contrary to common understanding. There are isotopes. An “element” is defined by the number of protons in its nucleus; isotopes will have the same number of protons, but varying numbers of neutrons.
The type of uranium we use for nuclear reactions is an unstable isotope that we have to make artificially. We make it by taking the naturally-occurring uranium and enriching it (we use a bunch of chemical reactions and lasers to isolate uranium atoms to, more or less, forcibly shove more neutrons into their nuclei).
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