Lead-207
Properties and data of the isotope 207Pb.
See also: list of Lead isotopes.
General data
Name of the isotope:Lead-207; Pb-207Other names:Actinium DSymbol:207Pb or 20782PbMass number A:207 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:125Isotopic mass:206.975897(8) u (atomic weight of Lead-207)Nuclide mass:206.9309186 u (calculated nuclear mass without electrons)Mass excess:-22.4518 MeVMass defect:1.748870124 u (per nucleus)Nuclear binding energy:1629.06202729 MeV (per nucleus)
7.86986487 MeV (average binding energy per nucleon)Separation energy:SN = 6.73778(10) MeV (first neutron)
SP = 7.4876(6) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μN) = + 0.59258Charge radius:5.4943(14) femtometer fmYear of discovery:1927
Parent Nuclides
Direct parent isotopes are: 207Bi, 211Po, 207Tl, 221Ra.
Occurrence
Comparison of the natural Lead isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Lead
Isotopic mixture | 207.2 u | 100 % | | |
| Isotope 204Pb | 203.973044(8) u | 1.4(6) % | 1.4 × 1017 a | 0+ |
| Isotope 206Pb | 205.974466(8) u | 24.1(30) % | stable | 0+ |
| Isotope 207Pb | 206.975897(8) u | 22.1(50) % | stable | 1/2- |
| Isotope 208Pb | 207.976653(8) u | 52.4(70) % | stable | 0+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 207Pb
Isotope:207Pb-NMRQuantity:22.1(50) %Spin:1/2-Nuclearmagnetic moment
μ/μN:+ 0.59258Gyromagnetic ratio γ:5.6264 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.18516Resonance frequency:v0 = 9.0340 at 1 TRelative Sensitivity:0.00955 (H0 = const.)
0.2122 (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 |
|---|
| 207mPb | 1633.356(4) keV | 806(5) ms | 13/2+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 125) and isobaric (same nucleon number A = 207) with Lead-207. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 125 | Isobar A = 207 |
|---|
| 76 | 201Os | |
| 77 | 202Ir | |
| 78 | 203Pt | 207Pt |
| 79 | 204Au | 207Au |
| 80 | 205Hg | 207Hg |
| 81 | 206Tl | 207Tl |
| 82 | 207Pb | 207Pb |
| 83 | 208Bi | 207Bi |
| 84 | 209Po | 207Po |
| 85 | 210At | 207At |
| 86 | 211Rn | 207Rn |
| 87 | 212Fr | 207Fr |
| 88 | 213Ra | 207Ra |
| 89 | 214Ac | 207Ac |
| 90 | 215Th | 207Th |
| 91 | 216Pa | |
| 92 | 217U | |
External data and identifiers
Last update: 2023-05-04
Perma link: https://www.chemlin.org/isotope/lead-207
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