Chromium: isotope data

Several Chromium isotopes are used for medical applications. Cr-50 is used for the production of the radioisotope Cr-51 which is used for measuring blood volume and red blood cell survival. Cr-53 and Cr-54 are used for the study of chromium metabolism and studies into (adult) diabetes.

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 chromium are listed (including any which occur naturally) below.
Isotope Mass / Da Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
50Cr 49.9460464 (17) 4.345 (13) 0
52Cr 51.9405098 (17) 83.789 (18) 0
53Cr 52.9406513 (17) 9.501 (17) 3/2 -0.47454
54Cr 53.9388825 (17) 2.365 (7) 0

In the above, 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 totals 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of chromium are listed above. This table gives information about some radiosotopes of chromium, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass / Da Half-life Mode of decay Nuclear spin Nuclear magnetic moment
48Cr 47.95404 21.6 h EC to 48V
49Cr 48.951341 42.3 m EC to 49V 5/2 0.476
51Cr 50.944772 27.70 d EC to 51V 7/2 -0.934
55Cr 54.940844 3.497 m β- to 55Mn 3/2
56Cr 55.94065 5.9 m β- to 56Mn 0

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  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. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
  3. 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]

NMR Properties of chromium

Common reference compound: K2CrO4/D2O, saturated.

Table of NMR-active nucleus propeties of chromium
  Isotope 1 Isotope 2 Isotope 3
Isotope 53Cr
Natural abundance /% 9.501
Spin (I) 3/2
Frequency relative to 1H = 100 (MHz) 5.652496
Receptivity, DP, relative to 1H = 1.00 0.0000863
Receptivity, DC, relative to 13C = 1.00 0.507
Magnetogyric ratio, γ (107 rad T‑1 s-1) -1.5152
Magnetic moment, μ (μN) -0.61263
Nuclear quadrupole moment, Q/millibarn -150(50)
Line width factor, 1056 l (m4) 300


  1. R.K. Harris in Encyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful to Professor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
  2. J. Mason in Multinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
  3. P. Pyykkö, Mol. Phys., 2008, 106, 1965-1974.
  4. P. Pyykkö, Mol. Phys., 2001, 99, 1617-1629.
  5. P. Pyykkö, Z. Naturforsch., 1992, 47a, 189. I am grateful to Professor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
  6. D.R. Lide, (ed.), CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
  7. P. Pyykkö, personal communication, 1998, 204, 2008, 2010.

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