17-chlorine Naturally occuring isotopes:
Cl-35 ( 75.77% ) Cl-37 ( 24.23% )
Isotopes:
Cl-28 Cl-29 Cl-30 Cl-31 Cl-32 Cl-33 Cl-34 Cl-36 Cl-38 Cl-39 Cl-40 Cl-41 Cl-42 Cl-43 Cl-44 Cl-45 Cl-46 Cl-47 Cl-48 Cl-49 Cl-50 Cl-51

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