Tin-125
Properties and data of the isotope 125Sn.
See also: List of individual Tin isotopes (and general data sources).
General data
Name of the isotope:Tin-125; Sn-125Symbol:125Sn or 12550SnMass number A:125 (= number of nucleons)Atomic number Z:50 (= number of protons)Neutrons N:75Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:124.9077864(11) u (atomic weight of Tin-125)Nuclide mass:124.880359 u (calculated nuclear mass without electrons)Mass excess:-85.89642 MeVMass defect:1.1333339 u (per nucleus)Nuclear binding energy:1055.69372785 MeV (per nucleus)
8.44554982 MeV (average binding energy per nucleon)Separation energy:SN = 5.7335(2) MeV (first neutron)
SP = 12.32(3) MeV (first proton)Half-life:9.64(3) dDecay constant λ:8.322133622444 × 10-7 s-1Specific activity α:4.041698462062 × 10+15 Bq g-1
109235.09356926 Ci g-1Spin and parity:
(nuclear angular momentum)11/2-Magnetic dipole moment:μ(μN) = - 1.346(2)Quadrupole moment Q:+ 0.14 barn (100 fm2)Nuclear g-factor:gl = -0.24472727272727Charge radius:4.6765(26) femtometer fmYear of discovery:1939
Radioactive Decay
Half-life T½ = 9.64(3) d respectively 8.32896 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 125Sb | 100 % | 2.3599(26) MeV | |
Parent Nuclides
Direct parent isotope is: 125In.
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 |
|---|
| 125mSn | 27.50(14) keV | 9.52(5) min | 3/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 125) with Tin-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 75 | Isobar A = 125 |
|---|
| 42 | 117Mo | |
| 43 | 118Tc | |
| 44 | 119Ru | |
| 45 | 120Rh | 125Rh |
| 46 | 121Pd | 125Pd |
| 47 | 122Ag | 125Ag |
| 48 | 123Cd | 125Cd |
| 49 | 124In | 125In |
| 50 | 125Sn | 125Sn |
| 51 | 126Sb | 125Sb |
| 52 | 127Te | 125Te |
| 53 | 128I | 125I |
| 54 | 129Xe | 125Xe |
| 55 | 130Cs | 125Cs |
| 56 | 131Ba | 125Ba |
| 57 | 132La | 125La |
| 58 | 133Ce | 125Ce |
| 59 | 134Pr | 125Pr |
| 60 | 135Nd | 125Nd |
| 61 | 136Pm | |
| 62 | 137Sm | |
| 63 | 138Eu | |
| 64 | 139Gd | |
| 65 | 140Tb | |
| 66 | 141Dy | |
| 67 | 142Ho | |
| 68 | 143Er | |
| 69 | 144Tm | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/tin-125
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