It's Elemental - Isotopes of the Element Magnesium

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Magnesium with a Known Natural Abundance

All Known Isotopes of the Element Magnesium

Mass Number	Half-life	Decay Mode	Branching Percentage

20	90.8 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	~ 27.00

21	122 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	32.60

		Electron Capture with delayed Alpha Decay	< 0.50

22	3.857 seconds	Electron Capture	100.00

23	11.317 seconds	Electron Capture	100.00

24	Stable	-	-

25	Stable	-	-

26	Stable	-	-

27	9.458 minutes	Beta-minus Decay	100.00

28	20.915 hours	Beta-minus Decay	100.00

29	1.30 seconds	Beta-minus Decay	100.00

30	335 milliseconds	Beta-minus Decay	100.00

31	230 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	1.70

32	95 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	2.40

33	90 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	17.00

34	20 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	No Data Available

35	70 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	52.00

36	> 200 nanoseconds	Beta-minus Decay	No Data Available

37	> 260 nanoseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	No Data Available

38	No Data Available	No Data Available	No Data Available