The right answer is 50% Cl-35 and 50% CI-37.
Chlorine has two stable isotopes chlorine 35, and chlorine37, with chlorine 35 accounting for about three of the four naturally occurring chlorine atoms. Chlorine 36, also known in nature, is a radioactive isotope with a half-life of about 30,000 years. Chlorine has two stable isotopes. Cl-35 and Cl-37 with atomic weights of 34.96 and 36.95 respectively. Chlorine has an atomic weight of 35.5 instead of 35 because it has what is called an isotope.
The main difference between chlorine 35 and 37 is that chlorine 35 has 18 neutrons per nucleus while chlorine 37 has 20 neutrons per nucleus. To calculate the proportion of each isotope in a sample of an element, chemists typically divide the number of atoms of a particular isotope by the total number of atoms of all isotopes of that element and multiply the result by 100. The reason chlorine has an atomic weight of 35.5 instead of 35 is due to what is called an isotope.
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