Magnesium: isotope data

The Magnesium isotopes Mg-25 and Mg-26 are used to study the absorption and metabolism of Mg in the human body and they are also used for heart disease studies. Mg-25 is also used for the production of the radioisotope Na-22.

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 magnesium are listed (including any which occur naturally) below.
Isotope Mass / Da Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
24Mg 23.9850423 (8) 78.99 (4) 0 0
25Mg 24.9858374 (8) 10.00 (1) 5/2 -0.85546
26Mg 25.9825937 (8) 11.01 (3) 0 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 magnesium are listed above. This table gives information about some radiosotopes of magnesium, 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
22Mg 21.999574 3.86 s EC to 22Na 0
23Mg 22.994124 11.32 s EC to 23Na 3/2 0.536
27Mg 26.984341 9.45 m β- to 27Al 1/2
28Mg 27.983876 21.0 h β- to 28Al 0
29Mg 28.98855 1.3 s β- to 29Al 3/2

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. 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 magnesium

Common reference compound: MgCl2/D2O, 11 M.

Table of NMR-active nucleus propeties of magnesium
  Isotope 1 Isotope 2 Isotope 3
Isotope 25Mg
Natural abundance /% 10.00
Spin (I) 5/2
Frequency relative to 1H = 100 (MHz) 6.121635
Receptivity, DP, relative to 1H = 1.00 0.000268
Receptivity, DC, relative to 13C = 1.00 1.58
Magnetogyric ratio, γ (107 rad T‑1 s-1) -1.63887
Magnetic moment, μ (μN) -1.01220
Nuclear quadrupole moment, Q/millibarn 199.4(20)
Line width factor, 1056 l (m4) 130

References

  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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