Antimony-122
Properties and data of the isotope 122Sb.
See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-122; Sb-122Symbol:122Sb or 12251SbMass number A:122 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:71Isotopic mass:121.9051681(28) u (atomic weight of Antimony-122)Nuclide mass:121.8771922 u (calculated nuclear mass without electrons)Mass excess:-88.33535 MeVMass defect:1.109117568 u (per nucleus)Nuclear binding energy:1033.13635989 MeV (per nucleus)
8.46833082 MeV (average binding energy per nucleon)Separation energy:SN = 6.80637(13) MeV (first neutron)
SP = 6.4271(27) MeV (first proton)Half-life:2.7238(2) dDecay constant λ:2.945347239898 × 10-6 s-1Specific activity α:1.465892228107 × 10+16 Bq g-1
396187.08867762 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = - 1.90(2)Quadrupole moment Q:+ 0.85(11) barn (100 fm2)Nuclear g-factor:gl = -0.95Year of discovery:1939
Radioactive Decay
Half-life T½ = 2.7238(2) d respectively 2.3533632 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 122Sn | 2.41(12) % | 1.606(4) MeV | |
| β- | 122Te | 97.59(12) % | 1.9791(21) MeV | |
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 |
|---|
| 122m1Sb | 61.4131(5) keV | 1.86(8) μs | 3+ |
| 122m2Sb | 137.4726(8) keV | 0.53(3) ms | (5)+ |
| 122m3Sb | 163.5591(17) keV | 4.191(3) min | (8)- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 122) with Antimony-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 71 | Isobar A = 122 |
|---|
| 40 | 111Zr | |
| 41 | 112Nb | |
| 42 | 113Mo | |
| 43 | 114Tc | |
| 44 | 115Ru | 122Ru |
| 45 | 116Rh | 122Rh |
| 46 | 117Pd | 122Pd |
| 47 | 118Ag | 122Ag |
| 48 | 119Cd | 122Cd |
| 49 | 120In | 122In |
| 50 | 121Sn | 122Sn |
| 51 | 122Sb | 122Sb |
| 52 | 123Te | 122Te |
| 53 | 124I | 122I |
| 54 | 125Xe | 122Xe |
| 55 | 126Cs | 122Cs |
| 56 | 127Ba | 122Ba |
| 57 | 128La | 122La |
| 58 | 129Ce | 122Ce |
| 59 | 130Pr | 122Pr |
| 60 | 131Nd | |
| 61 | 132Pm | |
| 62 | 133Sm | |
| 63 | 134Eu | |
| 64 | 135Gd | |
| 65 | 136Tb | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/antimony-122
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