Tellurium-125
Properties and data of the isotope 125Te.
See also: list of Tellurium isotopes.
General data
Name of the isotope:Tellurium-125; Te-125Symbol:125Te or 12552TeMass number A:125 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:73Isotopic mass:124.9044312(15) u (atomic weight of Tellurium-125)Nuclide mass:124.8759068 u (calculated nuclear mass without electrons)Mass excess:-89.02176 MeVMass defect:1.135009332 u (per nucleus)Nuclear binding energy:1057.2543827 MeV (per nucleus)
8.45803506 MeV (average binding energy per nucleon)Separation energy:SN = 6.56897(3) MeV (first neutron)
SP = 8.69170(14) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μN) = -0.8885051(4)Charge radius:4.7204(30) femtometer fmYear of discovery:1931
Parent Nuclides
Direct parent isotopes are: 125I, 125Sb.
Occurrence
Comparison of the natural Tellurium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| Atomic Mass ma | Quantity | Half-life | Spin |
---|
Tellurium Isotopic mixture | 127.60 u | 100 % | | |
Isotope 120Te | 119.90406(2) u | 0.09(1) % | stable | 0+ |
Isotope 122Te | 121.90304(1) u | 2.55(12) % | stable | 0+ |
Isotope 123Te | 122.90427(1) u | 0.89(3) % | 9.2 × 1016 a | 1/2+ |
Isotope 124Te | 123.90282(1) u | 4.74(14) % | stable | 0+ |
Isotope 125Te | 124.9044312(15) u | 7.07(15) % | stable | 1/2+ |
Isotope 126Te | 125.90331(1) u | 18.84(25) % | stable | 0+ |
Isotope 128Te | 127.904461(6) u | 31.74(8) % | 7.7(4) × 1024 a | 0+ |
Isotope 130Te | 129.90622275(8) u | 34.08(62) % | 0.79 × 1021 a | 0+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 125Te
Isotope:125Te-NMRQuantity:7.07(15) %Spin:1/2+Nuclearmagnetic moment
μ/μN:-0.8885051(4)Gyromagnetic ratio γ:8.5087 · 107 rad T-1 s-1Nuclear g-factor:gl = -1.7770102Resonance frequency:v0 = 13.5446 at 1 TRelative Sensitivity:0.03219 (H0 = const.)
0.3181 (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 |
---|
125mTe | 144.775(8) keV | 57.40(15) d | 11/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 73) and isobaric (same nucleon number A = 125) with Tellurium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 73 | Isobar A = 125 |
41 | 114Nb | |
42 | 115Mo | |
43 | 116Tc | |
44 | 117Ru | |
45 | 118Rh | 125Rh |
46 | 119Pd | 125Pd |
47 | 120Ag | 125Ag |
48 | 121Cd | 125Cd |
49 | 122In | 125In |
50 | 123Sn | 125Sn |
51 | 124Sb | 125Sb |
52 | 125Te | 125Te |
53 | 126I | 125I |
54 | 127Xe | 125Xe |
55 | 128Cs | 125Cs |
56 | 129Ba | 125Ba |
57 | 130La | 125La |
58 | 131Ce | 125Ce |
59 | 132Pr | 125Pr |
60 | 133Nd | 125Nd |
61 | 134Pm | |
62 | 135Sm | |
63 | 136Eu | |
64 | 137Gd | |
65 | 138Tb | |
66 | 139Dy | |
67 | 140Ho | |
External data and identifiers
Last update: 2023-05-29
Perma link: https://www.chemlin.org/isotope/tellurium-125
© 1996 - 2024 ChemLin