Final answer:
Unstable nuclei emit radiation through radioactive decay to form more stable nuclides.
Explanation:
Unstable nuclei spontaneously emit radiation in the form of particles and energy, which changes the number of protons and/or neutrons in the nucleus, resulting in a more stable nuclide. One type of nuclear reaction is radioactive decay, where a nucleus spontaneously disintegrates into a slightly lighter nucleus, releasing particles, energy, or both.
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