Isotopes of magnesium

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

Table

Z(p)	N(n)	isotopic mass (u)	nuclide symbol	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
12	7	19.03547(27)	Mg-19
12	8	20.018863(29)	Mg-20
12	9	21.011713(18)	Mg-21
12	10	21.9995738(14)	Mg-22
12	11	22.9941237(14)	Mg-23
12	12	23.985041700(14)	Mg-24	0.7899(4)	0.78958-0.79017
12	13	24.98583692(3)	Mg-25	0.1000(1)	0.09996-0.10012
12	14	25.982592929(30)	Mg-26	0.1101(3)	0.10987-0.11030
12	15	26.98434059(5)	Mg-27
12	16	27.9838768(22)	Mg-28
12	17	28.988600(15)	Mg-29
12	18	29.990434(9)	Mg-30
12	19	30.996546(13)	Mg-31
12	20	31.998975(19)	Mg-32
12	21	33.005254(21)	Mg-33
12	22	34.00946(25)	Mg-34
12	23	35.01734(43)#	Mg-35
12	24	36.02300(54)#	Mg-36
12	25	37.03140(97)#	Mg-37
12	26	38.03757(54)#	Mg-38
12	27	39.04677(55)#	Mg-39
12	28	40.05393(97)#	Mg-40

Notes

• Values marked # are not purely derived from experimental data, but at least partly from systematic trends.
• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values from Ame2003 denote one standard deviation. Values from IUPAC are 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).

Isotopes of sodium

Isotopes of magnesium

Isotopes of aluminium

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