Isotopes of chlorine

Isotope data
chlorine symbol icon

Both Chlorine isotopes, Cl-35 and Cl-37, are used to study the toxicity of environmental pollutant and are usually supplied in the form of NaCl. Chlorine isotopes can be obtained from Trace Sciences International.

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of chlorine are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
35Cl 34.968852721 (69) 75.78 (4) 3/2 0.8218736
37Cl 36.96590262 (11) 24.22 (4) 3/2 0.6841230

Isotopic abundances of Cl
In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which total 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of chlorine are listed above. This table gives information about some radiosotopes of chlorine, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass Half-life Mode of decay Nuclear spin Nuclear magnetic moment
36Cl 35.9683069 301000 y β- to 36Ar 0 1.28547
38Cl 37.9680106 37.2 m β- to 38Ar 2 2.05
39Cl 38.968009 55.6 m β- to 39Ar 3/2
40Cl 39.97042 1.38 m β- to 40Ar 2
41Cl 40.9707 34 s β- to 41Ar
42Cl 41.9732 6.8 s β- to 42Ar
43Cl 42.9742 3.3 s β- to 43Ar

Sheffield ChemPuter isotope pattern calculator

You can use WebElements to calculate an isotope pattern for an arbitrary chemical formula:

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References

  1. Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. [Copyright 1998 IUPAC]
  2. Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]
  3. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides

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chlorine atomic number