Lead-206
Properties and data of the isotope 206Pb.
See also: list of Lead isotopes.
General data
Name of the isotope:Lead-206; Pb-206Other names:Radium G. UranbleiSymbol:206Pb or 20682PbMass number A:206 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:124Isotopic mass:205.974466(8) u (atomic weight of Lead-206)Nuclide mass:205.9294876 u (calculated nuclear mass without electrons)Mass excess:-23.78477 MeVMass defect:1.741636208 u (per nucleus)Nuclear binding energy:1622.32367793 MeV (per nucleus)
7.87535766 MeV (average binding energy per nucleon)Separation energy:SN = 8.08666(6) MeV (first neutron)
SP = 7.2537(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4902(14) femtometer fmYear of discovery:1927
Parent Nuclides
Direct parent isotopes are: 206Bi, 210Po, 206Tl.
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+ |
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 |
---|
206m1Pb | 2200.16(4) keV | 125(2) μs | 7- |
206m2Pb | 4027.3(3) keV | 202(3) ns | 12+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 206) with Lead-206. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 124 | Isobar A = 206 |
75 | 199Re | |
76 | 200Os | |
77 | 201Ir | |
78 | 202Pt | 206Pt |
79 | 203Au | 206Au |
80 | 204Hg | 206Hg |
81 | 205Tl | 206Tl |
82 | 206Pb | 206Pb |
83 | 207Bi | 206Bi |
84 | 208Po | 206Po |
85 | 209At | 206At |
86 | 210Rn | 206Rn |
87 | 211Fr | 206Fr |
88 | 212Ra | 206Ra |
89 | 213Ac | 206Ac |
90 | 214Th | |
91 | 215Pa | |
92 | 216U | |
External data and identifiers
Last update: 2021-03-15
Perma link: https://www.chemlin.org/isotope/lead-206
© 1996 - 2025 ChemLin