Isotopes of magnesium

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Magnesium (Mg)
Standard atomic mass: 24.3050(6) u

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
	excitation energy
19Mg	12	7	19.03547(27)		1/2-#
20Mg	12	8	20.018863(29)	90.8(24) ms	0+
21Mg	12	9	21.011713(18)	122(2) ms	(5/2,3/2)+
22Mg	12	10	21.9995738(14)	3.8755(12) s	0+
23Mg	12	11	22.9941237(14)	11.317(11) s	3/2+
24Mg	12	12	23.985041700(14)	STABLE	0+	0.7899(4)	0.78958-0.79017
25Mg	12	13	24.98583692(3)	STABLE	5/2+	0.1000(1)	0.09996-0.10012
26Mg	12	14	25.982592929(30)	STABLE	0+	0.1101(3)	0.10987-0.11030
27Mg	12	15	26.98434059(5)	9.458(12) min	1/2+
28Mg	12	16	27.9838768(22)	20.915(9) h	0+
29Mg	12	17	28.988600(15)	1.30(12) s	3/2+
30Mg	12	18	29.990434(9)	335(17) ms	0+
31Mg	12	19	30.996546(13)	230(20) ms	3/2+
32Mg	12	20	31.998975(19)	86(5) ms	0+
33Mg	12	21	33.005254(21)	90.5(16) ms	7/2-#
34Mg	12	22	34.00946(25)	20(10) ms	0+
35Mg	12	23	35.01734(43)#	70(40) ms	(7/2-)#
36Mg	12	24	36.02300(54)#	3.9(13) ms	0+
37Mg	12	25	37.03140(97)#	40# ms [>260 ns]	7/2-#
38Mg	12	26	38.03757(54)#	1# ms [>260 ns]	0+
39Mg	12	27	39.04677(55)#	<260 ns	7/2-#
40Mg	12	28	40.05393(97)#	1# ms	0+

Notes

• Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

• Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
• Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
• Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
  • Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
  • National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
  • David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

External links

• Magnesium isotopes data from The Berkeley Laboratory Isotopes Project's

Isotopes of sodium	Isotopes of magnesium	Isotopes of aluminium
Index to isotope pages · Table of nuclides

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