Antimony-128
Properties and data of the isotope 128Sb.
See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-128; Sb-128Symbol:128Sb or 12851SbMass number A:128 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:77Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5098039215686 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:127.909146(21) u (atomic weight of Antimony-128)Nuclide mass:127.8811701 u (calculated nuclear mass without electrons)Mass excess:-84.62996 MeVMass defect:1.157129164 u (per nucleus)Nuclear binding energy:1077.85887349 MeV (per nucleus)
8.42077245 MeV (average binding energy per nucleon)Separation energy:SN = 6.002(20) MeV (first neutron)
SP = 8.448(22) MeV (first proton)Half-life:9.05(4) hDecay constant λ:2.127523574462 × 10-5 s-1Specific activity α:1.008838318759 × 10+17 Bq g-1
2726590.0507024 Ci g-1Spin and parity:
(nuclear angular momentum)8-Magnetic dipole moment:μ(μN) = 1.31(2)Nuclear g-factor:gl = 0.16375Year of discovery:1956
Radioactive Decay
Half-life T½ = 9.05(4) h (hours) respectively 3.2580 × 104 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 128Te | 100 % | 4.363(19) MeV | |
Parent Nuclides
Direct parent isotope is: 128Sn.
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 |
|---|
| 128mSb | +x keV | 10.41(18) min | 5+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 128) with Antimony-128. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 77 | Isobar A = 128 |
|---|
| 43 | 120Tc | |
| 44 | 121Ru | |
| 45 | 122Rh | |
| 46 | 123Pd | 128Pd |
| 47 | 124Ag | 128Ag |
| 48 | 125Cd | 128Cd |
| 49 | 126In | 128In |
| 50 | 127Sn | 128Sn |
| 51 | 128Sb | 128Sb |
| 52 | 129Te | 128Te |
| 53 | 130I | 128I |
| 54 | 131Xe | 128Xe |
| 55 | 132Cs | 128Cs |
| 56 | 133Ba | 128Ba |
| 57 | 134La | 128La |
| 58 | 135Ce | 128Ce |
| 59 | 136Pr | 128Pr |
| 60 | 137Nd | 128Nd |
| 61 | 138Pm | 128Pm |
| 62 | 139Sm | 128Sm |
| 63 | 140Eu | |
| 64 | 141Gd | |
| 65 | 142Tb | |
| 66 | 143Dy | |
| 67 | 144Ho | |
| 68 | 145Er | |
| 69 | 146Tm | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/antimony-128
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