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protons and neutrons bounce around inside a nucleus |
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probability that proton or neutron in any region |
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minuscule chance that 2 alpha particles together outside the nucleus greater chance in a large nucleus than in a small one |
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Outside range of strong force
like a suddenly released spring the positive alpha particle will be repelled from nucleus |
for heavy atoms, nucleus may - for shortest of instants - exist in a state that allows it to blow apart