Antimony-121
Properties and data of the isotope 121Sb.
See also: list of Antimony isotopes.
General data
Name of the isotope:Antimony-121; Sb-121Symbol:121Sb or 12151SbMass number A:121 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:70Isotopic mass:120.90381(2) u (atomic weight of Antimony-121)Nuclide mass:120.8758341 u (calculated nuclear mass without electrons)Mass excess:-89.60041 MeVMass defect:1.101810752 u (per nucleus)Nuclear binding energy:1026.33010462 MeV (per nucleus)
8.48206698 MeV (average binding energy per nucleon)Separation energy:SN = 9.254(8) MeV (first neutron)
SP = 5.7909(27) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = + 3.3580(16)Charge radius:4.6802(26) femtometer fmYear of discovery:1922
Parent Nuclides
Direct parent isotopes are: 121Te, 121Sn.
Occurrence
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 of the NMR active Nuclide 121Sb
Isotope:121Sb-NMRQuantity:57.21(5) %Spin:5/2+Nuclearmagnetic moment
μ/μN:+ 3.3580(16)Gyromagnetic ratio γ:6.4442 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.3432Quadrupole moment Q:-0.543(11) barn (100 fm2)Line width parameter (factor):l = 943.52 fm4Resonance frequency:v0 = 10.2551 at 1 TRelative Sensitivity:0.16302 (H0 = const.)
2.8101 (v0 = const.)
[related to 1H = 1.000]
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 121mSb | 2721.5+x keV | 179(6) μs | (25/2) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 121) with Antimony-121. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 70 | Isobar A = 121 |
|---|
| 39 | 109Y | |
| 40 | 110Zr | |
| 41 | 111Nb | |
| 42 | 112Mo | |
| 43 | 113Tc | 121Tc |
| 44 | 114Ru | 121Ru |
| 45 | 115Rh | 121Rh |
| 46 | 116Pd | 121Pd |
| 47 | 117Ag | 121Ag |
| 48 | 118Cd | 121Cd |
| 49 | 119In | 121In |
| 50 | 120Sn | 121Sn |
| 51 | 121Sb | 121Sb |
| 52 | 122Te | 121Te |
| 53 | 123I | 121I |
| 54 | 124Xe | 121Xe |
| 55 | 125Cs | 121Cs |
| 56 | 126Ba | 121Ba |
| 57 | 127La | 121La |
| 58 | 128Ce | 121Ce |
| 59 | 129Pr | 121Pr |
| 60 | 130Nd | |
| 61 | 131Pm | |
| 62 | 132Sm | |
| 63 | 133Eu | |
| 64 | 134Gd | |
| 65 | 135Tb | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/antimony-121
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