Isotopes of cobalt

Isotope data
cobalt symbol icon

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 cobalt are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
59Co 58.9331976 (16) 100 7/2 4.627

Isotopic abundances of Co
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 cobalt are listed above. This table gives information about some radiosotopes of cobalt, 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
55Co 54.942003 17.53 h EC to 55Fe 7/2 4.822
56Co 55.939844 77.3 d EC to 56Fe 4 3.85
57Co 56.936296 271.8 d EC to 57Fe 7/2 4.72
58Co 57.935757 70.88 d EC to 58Fe 2 4.04
60Co 59.933822 5.271 y β- to 60Ni 5 3.799
61Co 60.932479 1.650 h β- to 61Ni 7/2
62Co 61.93405 13.9 m β- to 62Ni 2

Sheffield ChemPuter isotope pattern calculator

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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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cobalt atomic number