Potassium has several isotopes, but the most notable ones are: 1. **Potassium-39 (⁴⁰K)**: This is the most abundant isotope, making up about 93.26% of natural potassium. It is stable and does not undergo radioactive decay. 2. **Potassium-40 (⁴⁰K)**: This isotope is radioactive and makes up about 0.012% of natural potassium. It has a half-life of approximately 1.
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