Boron has two stable isotopes and several unstable isotopes. The two stable isotopes of boron are: 1. **Boron-10 (¹⁰B)**: This isotope has 5 protons and 5 neutrons, and it constitutes about 19.9% of naturally occurring boron. It is often used in applications such as neutron capture therapy for treating cancer and in various nuclear applications.
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