See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-123; Sb-123Symbol:123Sb or 12351SbMass number A:123 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:72Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4117647058824 (= neutron-proton ratio)Neutron excess (N-Z):21Isotopic mass:122.90421(2) u (atomic weight of Antimony-123)Nuclide mass:122.8762341 u (calculated nuclear mass without electrons)Mass excess:-89.22781 MeVMass defect:1.118740584 u (per nucleus)Nuclear binding energy:1042.10014155 MeV (per nucleus) 8.47235887 MeV (average binding energy per nucleon)Separation energy:SN = 8.9600(21) MeV (first neutron) SP = 6.5717(27) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = + 2.5457(12)Charge radius:4.6879(25) femtometer fmYear of discovery:1922
Comparison of the natural Antimony isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Antimony Isotopic mixture
121.760 u
100 %
Isotope 121Sb
120.90381(2) u
57.21(5) %
stable
5/2+
Isotope 123Sb
122.90421(2) u
42.79(5) %
stable
7/2+
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide123Sb
Isotope:123Sb-NMRQuantity:42.79(5) %Spin:7/2+Nuclearmagnetic moment μ/μN:+ 2.5457(12)Gyromagnetic ratio γ:3.4904 · 107 rad T-1 s-1 5.55514 MHz T-1Nuclear g-factor:gl = 0.72734285714286Quadrupole moment Q:- 0.692(14) barn (100 fm2)Resonance frequency:v0 = 5.5532 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]: 0.04659 (H0 = const.) 2.7390 (v0 = const.)
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 123) with Antimony-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
