Phosphorus has several isotopes, but the most important ones are: 1. **Phosphorus-31 (\(^31P\))**: This is the only stable isotope of phosphorus and constitutes 100% of naturally occurring phosphorus. It has 15 protons and 16 neutrons. 2. **Radioactive isotopes**: Phosphorus also has several radioactive isotopes, which are produced in laboratory settings or through nuclear reactions.
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