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Isotopes of magnesium

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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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+

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.

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.

Isotopes of sodium	Isotopes of magnesium	Isotopes of aluminium
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_magnesium". A list of authors is available in Wikipedia.