Tellurium-131
Properties and data of the isotope 131Te.
See also: List of individual Tellurium isotopes (and general data sources).
General data
Name of the isotope:Tellurium-131; Te-131Symbol:131Te or 13152TeMass number A:131 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:79Isotopic mass:130.90852221(6) u (atomic weight of Tellurium-131)Nuclide mass:130.8799978 u (calculated nuclear mass without electrons)Mass excess:-85.21101 MeVMass defect:1.182907818 u (per nucleus)Nuclear binding energy:1101.87153502 MeV (per nucleus)
8.41123309 MeV (average binding energy per nucleon)Separation energy:SN = 5.92938(6) MeV (first neutron)
SP = 10.214(14) MeV (first proton)Half-life:25.0(1) minDecay constant λ:0.0004620981203733 s-1Specific activity α:2.140630747692 × 10+18 Bq g-1
57854885.072765 Ci g-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = 0.696(9)Nuclear g-factor:gl = 0.464Year of discovery:1939
Radioactive Decay
Half-life T½ = 25.0(1) min (minutes) respectively 1.500 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 131I | 100 % | 22.317(6) MeV | |
Parent Nuclides
Direct parent isotope is: 131Sb.
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 |
|---|
| 131mTe | 182.258(18) keV | 33.25(25) h | 11/2- |
| 131m2Te | 1940.0(4) keV | 93(12) ms | (23/2+) |
| 131m+Te | | | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 131) with Tellurium-131. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 79 | Isobar A = 131 |
|---|
| 44 | 123Ru | |
| 45 | 124Rh | |
| 46 | 125Pd | |
| 47 | 126Ag | 131Ag |
| 48 | 127Cd | 131Cd |
| 49 | 128In | 131In |
| 50 | 129Sn | 131Sn |
| 51 | 130Sb | 131Sb |
| 52 | 131Te | 131Te |
| 53 | 132I | 131I |
| 54 | 133Xe | 131Xe |
| 55 | 134Cs | 131Cs |
| 56 | 135Ba | 131Ba |
| 57 | 136La | 131La |
| 58 | 137Ce | 131Ce |
| 59 | 138Pr | 131Pr |
| 60 | 139Nd | 131Nd |
| 61 | 140Pm | 131Pm |
| 62 | 141Sm | 131Sm |
| 63 | 142Eu | 131Eu |
| 64 | 143Gd | |
| 65 | 144Tb | |
| 66 | 145Dy | |
| 67 | 146Ho | |
| 68 | 147Er | |
| 69 | 148Tm | |
| 70 | 149Yb | |
| 71 | 150Lu | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/tellurium-131
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