Iron-58

Properties and data of the isotope ⁵⁸Fe.

Contents

General data

Name of the isotope:Iron-58; Fe-58Symbol:⁵⁸Fe or 5826FeMass number A:58 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:32Isotopic mass:57.933274(3) u (atomic weight of Iron-58)Nuclide mass:57.9190113 u (calculated nuclear mass without electrons)Mass excess:-62.15487 MeVMass defect:0.547454144 u (per nucleus)Nuclear binding energy:509.95025041 MeV (per nucleus)
8.7922457 MeV (average binding energy per nucleon)Separation energy:S_N = 10.04459(18) MeV (first neutron)
S_P = 11.9578(15) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.7745(14) femtometer fmYear of discovery:1935

Parent Nuclides

Direct parent isotopes are: ⁵⁸Co, ⁵⁸Mn.

Occurrence

Comparison of the natural Iron isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Iron Isotopic mixture	55.845 u	100 %
Isotope ⁵⁴Fe	53.939609(3) u	5.845(105) %	stable	0+
Isotope ⁵⁶Fe	55.934936(3) u	91.754(106) %	stable	0+
Isotope ⁵⁷Fe	56.935393(3) u	2.119(29) %	stable	1/2-
Isotope ⁵⁸Fe	57.933274(3) u	0.282(12) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 58) with Iron-58. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 32	Isobar A = 58
16	⁴⁸S
17	⁴⁹Cl
18	⁵⁰Ar
19	⁵¹K
20	⁵²Ca	⁵⁸Ca
21	⁵³Sc	⁵⁸Sc
22	⁵⁴Ti	⁵⁸Ti
23	⁵⁵V	⁵⁸V
24	⁵⁶Cr	⁵⁸Cr
25	⁵⁷Mn	⁵⁸Mn
26	⁵⁸Fe	⁵⁸Fe
27	⁵⁹Co	⁵⁸Co
28	⁶⁰Ni	⁵⁸Ni
29	⁶¹Cu	⁵⁸Cu
30	⁶²Zn	⁵⁸Zn
31	⁶³Ga	⁵⁸Ga
32	⁶⁴Ge
33	⁶⁵As
34	⁶⁶Se
35	⁶⁷Br
36	⁶⁸Kr