Isotopes of aluminium

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Although aluminium (Al) has multiple isotopes, only one of these isotopes is stable; as such, it is considered a monoisotopic element.
Standard atomic mass: 26.9815386(8) u

[edit] 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
21Al	13	8	21.02804(32)#	<35 ns	1/2+#
22Al	13	9	22.01952(10)#	59(3) ms	(3)+
23Al	13	10	23.007267(20)	470(30) ms	5/2+#
23mAl				~0.35 s
24Al	13	11	23.9999389(30)	2.053(4) s	4+
24mAl	425.8(1) keV			131.3(25) ms	1+
25Al	13	12	24.9904281(5)	7.183(12) s	5/2+
26Al	13	13	25.98689169(6)	7.17(24)E+5 a	5+
26mAl	228.305(13) keV			6.3452(19) s	0+
27Al	13	14	26.98153863(12)	STABLE	5/2+	1.0000
28Al	13	15	27.98191031(14)	2.2414(12) min	3+
29Al	13	16	28.9804450(13)	6.56(6) min	5/2+
30Al	13	17	29.982960(15)	3.60(6) s	3+
31Al	13	18	30.983947(22)	644(25) ms	(3/2,5/2)+
32Al	13	19	31.98812(9)	31.7(8) ms	1+
32mAl	955.7(4) keV			200(20) ns	(4+)
33Al	13	20	32.99084(8)	41.7(2) ms	(5/2+)#
34Al	13	21	33.99685(12)	56.3(5) ms	4-#
35Al	13	22	34.99986(19)	38.6(4) ms	5/2+#
36Al	13	23	36.00621(23)	90(40) ms
37Al	13	24	37.01068(36)	10.7(13) ms
38Al	13	25	38.01723(78)	7.6(6) ms
39Al	13	26	39.02297(158)	7.6(16) ms	3/2+#
40Al	13	27	40.03145(75)#	10# ms [>260 ns]
41Al	13	28	41.03833(86)#	2# ms [>260 ns]	3/2+#
42Al	13	29	42.04689(97)#	1# ms

[edit] 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.

[edit] 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.

Isotopes of magnesium	Isotopes of aluminium	Isotopes of silicon
Index to isotope pages