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Tellurium-125

Properties and data of the isotope 125Te.


Contents

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 maQuantityHalf-lifeSpin
Tellurium
Isotopic mixture
127.60 u100 %
Isotope 120Te119.90406(2) u0.09(1) %stable0+
Isotope 122Te121.90304(1) u2.55(12) %stable0+
Isotope 123Te122.90427(1) u0.89(3) %9.2 × 1016 a1/2+
Isotope 124Te123.90282(1) u4.74(14) %stable0+
Isotope 125Te124.9044312(15) u7.07(15) %stable1/2+
Isotope 126Te125.90331(1) u18.84(25) %stable0+
Isotope 128Te127.904461(6) u31.74(8) %7.7(4) × 1024 a0+
Isotope 130Te129.90622275(8) u34.08(62) %0.79 × 1021 a0+

 

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 IsomerExcitation EnergyHalf-lifeSpin
125mTe144.775(8) keV57.40(15) d11/2-

 

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.

 

ZIsotone N = 73Isobar A = 125
41114Nb
42115Mo
43116Tc
44117Ru
45118Rh125Rh
46119Pd125Pd
47120Ag125Ag
48121Cd125Cd
49122In125In
50123Sn125Sn
51124Sb125Sb
52125Te125Te
53126I125I
54127Xe125Xe
55128Cs125Cs
56129Ba125Ba
57130La125La
58131Ce125Ce
59132Pr125Pr
60133Nd125Nd
61134Pm
62135Sm
63136Eu
64137Gd
65138Tb
66139Dy
67140Ho

 

External data and identifiers

Adopted Levels, Gammas:NuDat 125Te

 


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Last update: 2023-05-29


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