| 1. | :Chlorine has two major natural isotopes : 35 Cl and 37 Cl.
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| 2. | One approach would use silicon with all three of its natural isotopes present.
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| 3. | In the early history of the study of radioactivity, the different natural isotopes of radium were given different names.
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| 4. | In the early history of the study of radioactivity, the different natural isotopes of thorium were given different names.
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| 5. | The concentration and location of some natural isotopes, particularly uranium-238 ( 238 U ), can be affected by human activity.
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| 6. | Atomic mass for natural life is based on weighted average abundance of natural isotopes that occur in Earth's crust and atmosphere.
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| 7. | Moreover, the weighted average mass can be near-integer, but at the same time not corresponding to the mass of any natural isotope.
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| 8. | For synthetic elements the isotope formed depends on the means of synthesis, so the concept of natural isotope abundance has no meaning.
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| 9. | This is thought to be as a result of natural isotope separation processes that occur from solar heating of ices in comets.
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| 10. | For " synthetic " elements, the isotope depends on the means of synthesis, so the concept of natural isotope abundance has no meaning.
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