Isotopes of chlorine

Isotopes of chlorine (17Cl)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
35Cl 75.8% stable
36Cl trace 3.01×105 y β− 36Ar
ε 36S
37Cl 24.2% stable
Standard atomic weight Ar°(Cl)
  • [35.446, 35.457]
  • 35.45±0.01 (abridged)

Chlorine (17Cl) has two stable isotopes, 35Cl (75.8%) and 37Cl (24.2%), giving chlorine a standard atomic weight of 35.45. Artificical radioisotopes are known ranging from 28Cl to 52Cl, and there are also two isomers, 34mCl and 38mCl. The longest-lived radioactive isotope is 36Cl, which has a half-life of 301,000 years. All other isotopes and isomers have half-lives under an hour, and most under 10 seconds.

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