Isotopes of iron

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Iron (Fe)
Standard atomic mass: 55.845(2) u

Table

Z(p)	N(n)	isotopic mass (u)	nuclide symbol	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
26	19	45.01458(24)#	Fe-45
26	20	46.00081(38)#	Fe-46
26	21	46.99289(28)#	Fe-47
26	22	47.98050(8)#	Fe-48
26	23	48.97361(16)#	Fe-49
26	24	49.96299(6)	Fe-50
26	25	50.956820(16)	Fe-51
26	26	51.948114(7)	Fe-52
26	27	52.9453079(19)	Fe-53
26	28	53.9396105(7)	Fe-54	0.05845(35)	0.05837-0.05861
26	29	54.9382934(7)	Fe-55
26	30	55.9349375(7)	Fe-56	0.91754(36)	0.91742-0.91760
26	31	56.9353940(7)	Fe-57	0.02119(10)	0.02116-0.02121
26	32	57.9332756(8)	Fe-58	0.00282(4)	0.00281-0.00282
26	33	58.9348755(8)	Fe-59
26	34	59.934072(4)	Fe-60
26	35	60.936745(21)	Fe-61
26	36	61.936767(16)	Fe-62
26	37	62.94037(18)	Fe-63
26	38	63.9412(3)	Fe-64
26	39	64.94538(26)	Fe-65
26	40	65.94678(32)	Fe-66
26	41	66.95095(45)	Fe-67
26	42	67.95370(75)	Fe-68
26	43	68.95878(54)#	Fe-69
26	44	69.96146(64)#	Fe-70
26	45	70.96672(86)#	Fe-71
26	46	71.96962(86)#	Fe-72

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 manganese

Isotopes of iron

Isotopes of cobalt

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