Neon has three stable isotopes: 1. **Neon-20 (¹⁴Ne)**: This is the most abundant isotope, making up about 90.48% of natural neon. It has 10 protons and 10 neutrons. 2. **Neon-21 (¹⁵Ne)**: This isotope is much less common, accounting for about 0.27% of natural neon. It has 10 protons and 11 neutrons.
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