The main difference between a radioactive isotope and a stable isotope of the same element lies in their stability and behavior over time. Here are some clarifications based on your responses:
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Radioactive isotopes last for less time: This is generally true; radioactive isotopes are unstable and undergo radioactive decay, meaning they eventually transform into other elements or isotopes.
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Stable isotopes break down quickly: This statement is incorrect. Stable isotopes do not undergo radioactive decay, which means they do not break down over time.
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Stable isotopes are usually heavier: This statement can be true in some cases, but it is not a definitive difference between stable and radioactive isotopes. Some stable isotopes can be lighter than their radioactive counterparts.
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Radioactive isotopes do not break down: This is incorrect. Radioactive isotopes are defined by their ability to break down or decay over time.
In summary, the primary distinction is that radioactive isotopes are unstable and will decay over time, while stable isotopes do not undergo this process.