Chlorine has isotopes with mass numbers 35 and 37, but both have the same atomic number (17). This illustrates isotopes, where the number of neutrons differs but the number of protons remains constant.
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Isotopes are variations of an element with the same number of protons but different numbers of neutrons. Chlorine has two stable isotopes, chlorine-35 and chlorine-37, distinguished by their respective neutron counts of 18 and 20, impacting their atomic masses.