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Potassium usually has three isotopes, it goes by the name of potassium-39, 40 and 41.

Potassium usually has three isotopes, it goes by the name of potassium-39, 40 and 41. The potassium-40 is highly radioactive and can be found in rocks, plants, and animals. It is used to measure the age of objects. This isotope breaks down into an isotope of argon.

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