Isotopes of aluminium

From Freepedia

Aluminium (Al)
Standard atomic mass: 26.9815386(8) u
Is considered a monoisotopic element.

Table

Z(p)	N(n)	isotopic mass (u)	nuclide symbol	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
13	8	21.02804(32)#	Al-21
13	9	22.01952(10)#	Al-22
13	10	23.007267(20)	Al-23
13	11	23.9999389(30)	Al-24
13	12	24.9904281(5)	Al-25
13	13	25.98689169(6)	Al-26
13	14	26.98153863(12)	Al-27	1.0000
13	15	27.98191031(14)	Al-28
13	16	28.9804450(13)	Al-29
13	17	29.982960(15)	Al-30
13	18	30.983947(22)	Al-31
13	19	31.98812(9)	Al-32
13	20	32.99084(8)	Al-33
13	21	33.99685(12)	Al-34
13	22	34.99986(19)	Al-35
13	23	36.00621(23)	Al-36
13	24	37.01068(36)	Al-37
13	25	38.01723(78)	Al-38
13	26	39.02297(158)	Al-39
13	27	40.03145(75)#	Al-40
13	28	41.03833(86)#	Al-41
13	29	42.04689(97)#	Al-42

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) and Atomic Weights Revised (2005).

Isotopes of magnesium

Isotopes of aluminium

Isotopes of silicon

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