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Thallium-208

Properties and data of the isotope 208Tl.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: List of individual Thallium isotopes (and general data sources).

 

General data

Name of the isotope:Thallium-208; Tl-208Other names:Thorium C ยดยดSymbol:208Tl or 20881TlMass number A:208 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:127Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5679012345679 (= neutron-proton ratio)Neutron excess (N-Z):46Isotopic mass:207.9820180(20) u (atomic weight of Thallium-208)Nuclide mass:207.937588 u (calculated nuclear mass without electrons)Mass excess:-16.75013 MeVMass defect:1.752253924 u (per nucleus)Nuclear binding energy:1632.21401668 MeV (per nucleus)
7.84718277 MeV (average binding energy per nucleon)Separation energy:SN = 3.787(6) MeV (first neutron)
SP = 7.550(30) MeV (first proton)Half-life:3.053(4) minDecay constant λ:0.0037839675759359 s-1Specific activity α:1.100849553223 × 10+19 Bq g-1
297526906.27654 Ci g-1Spin and parity:
(nuclear angular momentum)5+Magnetic dipole moment:μ(μN) = 0.292(13)Nuclear g-factor:gl = 0.0584Charge radius:5.4946(28) femtometer fmYear of discovery:1909

 

Radioactive Decay

Half-life T½ = 3.053(4) min (minutes) respectively 1.8318 × 102 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
β-208Pb100 %4.9985(17) MeV

 

Parent Nuclides

Direct parent isotopes are: 208Hg, 212Bi.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 208) with Thallium-208. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 127Isobar A = 208
76203Os
77204Ir
78205Pt208Pt
79206Au208Au
80207Hg208Hg
81208Tl208Tl
82209Pb208Pb
83210Bi208Bi
84211Po208Po
85212At208At
86213Rn208Rn
87214Fr208Fr
88215Ra208Ra
89216Ac208Ac
90217Th208Th
91218Pa
92219U
93220Np

 

External data and identifiers

CAS:14913-50-9InChI Key:BKVIYDNLLOSFOA-RNFDNDRNSA-NSMILES:[208Tl]PubChem:ID 6335611Adopted Levels, Gammas:NuDat 208Tl

 

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Last update: 2021-03-15

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