The main differences between a radioactive isotope and a stable isotope of the same element are:
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Radioactive isotopes undergo radioactive decay: They have unstable nuclei that break down over time, emitting radiation in the process. This decay can result in the transformation of the isotope into a different element or a different isotope.
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Stable isotopes do not undergo radioactive decay: They have stable nuclei and do not emit radiation. This means they remain unchanged over time.
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Lifespan: Radioactive isotopes have a finite lifespan and eventually decay, while stable isotopes remain stable indefinitely.
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Weight is not a definitive factor: The weight of the isotopes can vary, but it isn't a general rule that stable isotopes are "usually heavier." They can have similar masses, depending on the specific isotopes being compared.
Given the options you provided, the correct statement is that radioactive isotopes "last for less time," as they decay over time, while stable isotopes remain unchanged. The statements about stable isotopes being heavier and breaking down quickly are incorrect.
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