![]() ![]() The radioactive isotope that lived longest is 36Cl, which has a half-life of 3.01 × 10 5 years. The stable isotopes of Chlorine are 35Cl with 75.77% of abundance and 37Cl which is 24.23% abundant, thus giving chlorine a standard atomic weight of 35.45. Out of these 25 isotopes, only two isotopes are stable. The element Chlorine (Cl) has a total of 25 isotopes ranging from 28Cl to 52Cl. Element 43 (technetium), element 61 (promethium), and most of the elements with atomic number 84 (polonium) and higher have their atomic mass given in square brackets.
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