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5 September, 16:21

How are some isotopes considered radioactive

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  1. 5 September, 16:41
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    Some isotopes are stable, but others are radioactive. An isotope will be radioactive if its nuclei are unstable. Large atomic nuclei, with more than 93 protons and their associated complement of neutrons, are inherently unstable. Uranium and plutonium are examples of such elements.
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