Thallium-204
Properties and data of the isotope 204Tl.
See also: list of Thallium isotopes.
General data
Name of the isotope:Thallium-204; Tl-204Symbol:204Tl or 20481TlMass number A:204 (= number of nucleons)Atomic number Z:81 (= number of protons)Neutrons N:123Isotopic mass:203.9738633(12) u (atomic weight of Thallium-204)Nuclide mass:203.9294333 u (calculated nuclear mass without electrons)Mass excess:-24.34618 MeVMass defect:1.72574896 u (per nucleus)Nuclear binding energy:1607.52480175 MeV (per nucleus)
7.88002354 MeV (average binding energy per nucleon)Separation energy:SN = 6.65608(28) MeV (first neutron)
SP = 6.3658(12) MeV (first proton)Half-life:3.783(12) aDecay constant λ:5.810070163367 × 10-9 s-1Specific activity α:17235990605870 Bq g-1
465.83758394243 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = 0.09(1)Nuclear g-factor:gl = 0.045Charge radius:5.4704(28) femtometer fmYear of discovery:1953
Radioactive Decay
Half-life T½ = 3.783(12) a respectively 1.19301 × 108 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE/β+ | 204Hg | 2.92(7) % | 0.3440(12) MeV | |
| β- | 204Pb | 97.08(7) % | 0.76375(18) MeV | |
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 |
|---|
| 204m1Tl | 1103.9(3) keV | 61.7(10) μs | (7)+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 204) with Thallium-204. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 123 | Isobar A = 204 |
|---|
| 74 | 197W | |
| 75 | 198Re | |
| 76 | 199Os | |
| 77 | 200Ir | 204Ir |
| 78 | 201Pt | 204Pt |
| 79 | 202Au | 204Au |
| 80 | 203Hg | 204Hg |
| 81 | 204Tl | 204Tl |
| 82 | 205Pb | 204Pb |
| 83 | 206Bi | 204Bi |
| 84 | 207Po | 204Po |
| 85 | 208At | 204At |
| 86 | 209Rn | 204Rn |
| 87 | 210Fr | 204Fr |
| 88 | 211Ra | 204Ra |
| 89 | 212Ac | 204Ac |
| 90 | 213Th | |
| 91 | 214Pa | |
| 92 | 215U | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/thallium-204
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