Antimony-120
Properties and data of the isotope 120Sb.
See also: list of Antimony isotopes.
General data
Name of the isotope:Antimony-120; Sb-120Symbol:120Sb or 12051SbMass number A:120 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:69Isotopic mass:119.905080(8) u (atomic weight of Antimony-120)Nuclide mass:119.8771041 u (calculated nuclear mass without electrons)Mass excess:-88.41741 MeVMass defect:1.091875836 u (per nucleus)Nuclear binding energy:1017.07578998 MeV (per nucleus)
8.47563158 MeV (average binding energy per nucleon)Separation energy:SN = 7.015(11) MeV (first neutron)
SP = 5.642(7) MeV (first proton)Half-life:15.89(4) minDecay constant λ:0.00072702662110336 s-1Specific activity α:3.679207328746 × 10+18 Bq g-1
99438035.912068 Ci g-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μN) = 2.3(2)Nuclear g-factor:gl = 2.3Year of discovery:1937
Radioactive Decay
Half-life T½ = 15.89(4) min (minutes) respectively 9.534 × 102 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE/β+ | 120Sn | 100 % | 2.681(7) 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 |
|---|
| 120m1Sb | +x keV | 5.76(2) d | 8- |
| 120m2Sb | 78.16(5) keV | 246(2) ns | 3+ |
| 120m3Sb | 2328.3+x keV | 400(8) ns | (6) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 120) with Antimony-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 69 | Isobar A = 120 |
|---|
| 38 | 107Sr | |
| 39 | 108Y | |
| 40 | 109Zr | |
| 41 | 110Nb | |
| 42 | 111Mo | |
| 43 | 112Tc | 120Tc |
| 44 | 113Ru | 120Ru |
| 45 | 114Rh | 120Rh |
| 46 | 115Pd | 120Pd |
| 47 | 116Ag | 120Ag |
| 48 | 117Cd | 120Cd |
| 49 | 118In | 120In |
| 50 | 119Sn | 120Sn |
| 51 | 120Sb | 120Sb |
| 52 | 121Te | 120Te |
| 53 | 122I | 120I |
| 54 | 123Xe | 120Xe |
| 55 | 124Cs | 120Cs |
| 56 | 125Ba | 120Ba |
| 57 | 126La | 120La |
| 58 | 127Ce | 120Ce |
| 59 | 128Pr | |
| 60 | 129Nd | |
| 61 | 130Pm | |
| 62 | 131Sm | |
| 63 | 132Eu | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/antimony-120
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