Iridium-204
Properties and data of the isotope 204Ir.
See also: list of Iridium isotopes.
General data
Name of the isotope:Iridium-204; Ir-204Symbol:204Ir or 20477IrMass number A:204 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:127Isotopic mass:203.98960(43) u (atomic weight of Iridium-204)Nuclide mass:203.9473638 u (calculated nuclear mass without electrons)Mass excess:-9.68754 MeVMass defect:1.713371796 u (per nucleus)Nuclear binding energy:1595.99554774 MeV (per nucleus)
7.82350759 MeV (average binding energy per nucleon)Separation energy:SN = 3.07(57) MeV (first neutron)
SP = 9.34(57) MeV (first proton)Half-life:160 nsDecay constant λ:4332169.8784997 s-1Specific activity α:1.285169322044 × 10+28 Bq g-1
3.473430600119 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)
Radioactive Decay
Half-life T½ = 160 ns respectively 1.6 × 10-7 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 204Pt | ? | 4.94(45) MeV | |
β-, n | 203Pt | ? | 1.87(45) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 204) with Iridium-204. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 127 | Isobar A = 204 |
76 | 203Os | |
77 | 204Ir | 204Ir |
78 | 205Pt | 204Pt |
79 | 206Au | 204Au |
80 | 207Hg | 204Hg |
81 | 208Tl | 204Tl |
82 | 209Pb | 204Pb |
83 | 210Bi | 204Bi |
84 | 211Po | 204Po |
85 | 212At | 204At |
86 | 213Rn | 204Rn |
87 | 214Fr | 204Fr |
88 | 215Ra | 204Ra |
89 | 216Ac | 204Ac |
90 | 217Th | |
91 | 218Pa | |
92 | 219U | |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-204
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