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The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. What causes the nucleus of an isotope to be radioactive?.
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The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. What causes the nucleus of an isotope to be radioactive?.

User Marcelo Austria
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Answer:

an unstable ratio of protons and neutrons

Step-by-step explanation:

User Jongosi
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