| 21. | The isotopes,, and each have only one excited state.
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| 22. | Most reactor designs use the naturally occurring mix of lithium isotopes.
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| 23. | This was determined by comparing the ratios of carbon isotopes present.
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| 24. | Enrichment is accomplished using one or more methods of isotope separation.
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| 25. | The amendment allowed exports to five countries for creating medical isotopes.
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| 26. | Isotope tracers are commonly used in the form of isotope ratios.
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| 27. | Isotope tracers are commonly used in the form of isotope ratios.
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| 28. | Its 41 isotopes have mass numbers ranging from 108 to 148.
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| 29. | The isotopes of chromium range from 42 Cr to 67 Cr.
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| 30. | Cesium _ 137 is named after a radioactive isotope of caesium.
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