Iron-57
Properties and data of the isotope 57Fe.
See also: list of Iron isotopes.
General data
Name of the isotope:Iron-57; Fe-57Symbol:57Fe or 5726FeMass number A:57 (= number of nucleons)Atomic number Z:26 (= number of protons)Neutrons N:31Isotopic mass:56.935393(3) u (atomic weight of Iron-57)Nuclide mass:56.9211303 u (calculated nuclear mass without electrons)Mass excess:-60.18103 MeVMass defect:0.536670228 u (per nucleus)Nuclear binding energy:499.90509736 MeV (per nucleus)
8.77026487 MeV (average binding energy per nucleon)Separation energy:SN = 7.64607(4) MeV (first neutron)
SP = 10.55927(21) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2-Isobaric spin: 5/2Magnetic dipole moment:μ(μN) = +0.09064(7)Charge radius:3.7532(17) femtometer fmYear of discovery:1935
Parent Nuclides
Direct parent isotopes are: 57Co, 57Mn.
Occurrence
Comparison of the natural Iron isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| Atomic Mass ma | 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+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 57Fe
Isotope:57Fe-NMRQuantity:2.119(29) %Spin:1/2-Nuclearmagnetic moment
μ/μN:+0.09064(7)Gyromagnetic ratio γ:0.8661 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.18128Quadrupole moment Q:+ 0.160 barn (100 fm2)Resonance frequency:v0 = 1.3816 at 1 TRelative Sensitivity:0.00003 (H0 = const.)
0.0324 (v0 = const.)
[related to 1H = 1.000]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 31) and isobaric (same nucleon number A = 57) with Iron-57. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 31 | Isobar A = 57 |
15 | 46P | |
16 | 47S | |
17 | 48Cl | |
18 | 49Ar | |
19 | 50K | |
20 | 51Ca | 57Ca |
21 | 52Sc | 57Sc |
22 | 53Ti | 57Ti |
23 | 54V | 57V |
24 | 55Cr | 57Cr |
25 | 56Mn | 57Mn |
26 | 57Fe | 57Fe |
27 | 58Co | 57Co |
28 | 59Ni | 57Ni |
29 | 60Cu | 57Cu |
30 | 61Zn | 57Zn |
31 | 62Ga | |
32 | 63Ge | |
33 | 64As | |
34 | 65Se | |
35 | 66Br | |
36 | 67Kr | |
External data and identifiers
Last update: 2020-10-13
Perma link: https://www.chemlin.org/isotope/iron-57
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