| 11. | They occur among the 80 different elements that have one or more stable isotopes.
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| 12. | Other elements occur with many stable isotopes, such as tin with ten stable isotopes.
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| 13. | The content of four stable isotopes of lead are usually used in this analysis.
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| 14. | For a list, see the article list of stable isotopes.
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| 15. | The atomic number defines the stable isotope, such as fluorine.
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| 16. | The noble gases up to xenon have multiple stable isotopes.
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| 17. | Other elements occur with many stable isotopes, such as tin with ten stable isotopes.
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| 18. | In addition, about 1 % of the carbon atoms are of the stable isotope.
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| 19. | For each of the 80 stable elements, the number of the stable isotopes is given.
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| 20. | Double-magic effects may allow existence of stable isotopes which otherwise would not have been expected.
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