Chromium-53
Properties and data of the isotope 53Cr.
Chromium-53 is a stable, naturally occurring isotope of the chemical element chromium, which has 29 neutrons in its atomic nucleus in addition to the element-specific 24 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 53.
The discovery of Cr-53 by the analysis of Chromium hexacarbonyl with a Cavendish mass spectrometer was reported in 1930 [1].
See also: List of individual Chromium isotopes (and general data sources).
General data
Name of the isotope:Chromium-53; Cr-53Symbol:53Cr or 5324CrMass number A:53 (= number of nucleons)Atomic number Z:24 (= number of protons)Neutrons N:29Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2083333333333 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:52.94064630(12) u (atomic weight of Chromium-53)Nuclide mass:52.9274807 u (calculated nuclear mass without electrons)Mass excess:-55.28762 MeVMass defect:0.49843703200001 u (per nucleus)Nuclear binding energy:464.29110469 MeV (per nucleus)
8.76020952 MeV (average binding energy per nucleon)Separation energy:SN = 7.93943(10) MeV (first neutron)
SP = 11.13356(16) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = -0.47431(7)Charge radius:3.6511(75) femtometer fmMirror nucleus:Copper-53Year of discovery:1930
Parent Nuclides
Direct parent isotopes are: 53Mn, 53V.
Occurrence
Comparison of the natural Chromium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Chromium
Isotopic mixture | 51.9961 u | 100 % | | |
| Isotope 50Cr | 49.9460414(5) u | 4.345(13) % | 1.3 × 1018 a | 0+ |
| Isotope 52Cr | 51.940506(4) u | 83.789(18) % | stable | 0+ |
| Isotope 54Cr | 53.938879(4) u | 2.365(7) % | stable | 0+ |
| Isotope 53Cr | 52.94064630(12) u | 9.501(17) % | stable | 3/2- |
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide 53Cr
Isotope:53Cr-NMRQuantity:9.501(17) %Spin:3/2-Nuclearmagnetic moment
μ/μN:-0.47431(7)Gyromagnetic ratio γ:-1.5152 · 107 rad T-1 s-1
-2.41152 MHz T-1Nuclear g-factor:gl = -0.31620666666667Quadrupole moment Q:-0.15(5) barn (100 fm2)Line width parameter (factor):l = 300 fm4Resonance frequency:v0 = 2.4115 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]:
0.00091 (H0 = const.)
0.2832 (v0 = const.)
0.0000863 (at natural abundance)
relative receptivity as compared to 13C:
0.507 (at natural abundance)
5.3 (enriched)Reference compound:
(conditions)Saturated solution of potassium chromate K2CrO4 in Deuterium Oxide D2O.Frequency ratio:Ξ(53Cr) = 5.652496 % [based on the reference substance]Chemical shift range:ca. 1795 ppm [-1795 to 0]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 53) with Chromium-53. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 29 | Isobar A = 53 |
|---|
| 13 | 42Al | |
| 14 | 43Si | |
| 15 | 44P | |
| 16 | 45S | |
| 17 | 46Cl | |
| 18 | 47Ar | 53Ar |
| 19 | 48K | 53K |
| 20 | 49Ca | 53Ca |
| 21 | 50Sc | 53Sc |
| 22 | 51Ti | 53Ti |
| 23 | 52V | 53V |
| 24 | 53Cr | 53Cr |
| 25 | 54Mn | 53Mn |
| 26 | 55Fe | 53Fe |
| 27 | 56Co | 53Co |
| 28 | 57Ni | 53Ni |
| 29 | 58Cu | 53Cu |
| 30 | 59Zn | |
| 31 | 60Ga | |
| 32 | 61Ge | |
| 33 | 62As | |
| 34 | 63Se | |
External data and identifiers
Literature and References
[1] - F. W. Aston:
Constitution of Chromium.
In: Nature, 126, 200, (1930), DOI 10.1038/126200a0.
Last update: 2026-01-13
Perma link: https://www.chemlin.org/isotope/chromium-53
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