鎂嘅同位素

鎂有22個同位素，其中3個係穩定嘅。

圖表

符號	Z（p）	N（n）	質量（u）	半衰期	原子核自旋	相對豐度	相對豐度嘅變化量
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)	穩定	0+	0.7899(4)	0.78958-0.79017
²⁵Mg	12	13	24.98583692(3)	穩定	5/2+	0.1000(1)	0.09996-0.10012
²⁶Mg	12	14	25.982592929(30)	穩定	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+

備註：有#嘅數據代表冇經過實驗嘅證明，只係理論推測，而用咗括號括係代表數據唔確定。

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.

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