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