Bismuth (Bi) has several isotopes, but the most notable ones are: 1. **Bismuth-209 (Bi-209)**: This is the most stable and abundant isotope of bismuth, constituting nearly 100% of natural bismuth. It has a half-life of about 1.9 x 10^19 years, making it effectively stable for practical purposes.
Bismuth-209 is an isotope of the element bismuth, which has the chemical symbol Bi and an atomic number of 83. Bismuth-209 is notable because it is the most stable isotope of bismuth, with a half-life of about 1.9 × 10^19 years, making it extremely long-lived compared to other isotopes of bismuth.
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