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Thallium-205

Properties and data of the isotope 205Tl.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Thallium isotopes.

 

General data

Name of the isotope:Thallium-205; Tl-205Symbol:205Tl or 20581TlMass number A:205 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:124Isotopic mass:204.974428(9) u (atomic weight of Thallium-205)Nuclide mass:204.929998 u (calculated nuclear mass without electrons)Mass excess:-23.82016 MeVMass defect:1.733849176 u (per nucleus)Nuclear binding energy:1615.07010435 MeV (per nucleus)
7.87839075 MeV (average binding energy per nucleon)Separation energy:SN = 7.5460(5) MeV (first neutron)
SP = 6.4197(13) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μN) = + 1.6382146Charge radius:5.4759(26) femtometer fmYear of discovery:1931

 

Parent Nuclides

Direct parent isotopes are: 205Pb, 205Hg, 209Bi.

 

Occurrence

Comparison of the natural Thallium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Thallium
Isotopic mixture		204.38 u100 %
Isotope 203Tl202.972345(9) u29.52(1) %
[29.44 - 29.59 %]		stable1/2+
Isotope 205Tl204.974428(9) u70.48(1) %
[70.41 - 70.56 %]		stable1/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 205Tl

Isotope:205Tl-NMRQuantity:70.48(1) % [70.41 - 70.56 %]Spin:1/2+Nuclearmagnetic moment
μ/μN:+ 1.6382146Gyromagnetic ratio γ:15.6922 · 107 rad T-1 s-1Nuclear g-factor:gl = 3.2764292Resonance frequency:v0 = 24.9749 at 1 TRelative Sensitivity:0.20182 (H0 = const.)
0.5866 (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
205m1Tl3290.60(17) keV2.6(2) μs25/2+
205m2Tl4835.6(15) keV235(10) ns(35/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 205) with Thallium-205. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 124Isobar A = 205
75199Re
76200Os
77201Ir205Ir
78202Pt205Pt
79203Au205Au
80204Hg205Hg
81205Tl205Tl
82206Pb205Pb
83207Bi205Bi
84208Po205Po
85209At205At
86210Rn205Rn
87211Fr205Fr
88212Ra205Ra
89213Ac205Ac
90214Th
91215Pa
92216U

 

External data and identifiers

Adopted Levels, Gammas:NuDat 205Tl

 

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Last update: 2023-05-16

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