Iridium-203
Properties and data of the isotope 203Ir.
See also: List of individual Iridium isotopes (and general data sources).
General data
Name of the isotope:Iridium-203; Ir-203Symbol:203Ir or 20377IrMass number A:203 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:126Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.6363636363636 (= neutron-proton ratio)Neutron excess (N-Z):49Isotopic mass:202.98423(43) u (atomic weight of Iridium-203)Nuclide mass:202.9419938 u (calculated nuclear mass without electrons)Mass excess:-14.68966 MeVMass defect:1.71007688 u (per nucleus)Nuclear binding energy:1592.92635326 MeV (per nucleus)
7.84692785 MeV (average binding energy per nucleon)Separation energy:SN = 5.98(5) MeV (first neutron)
SP = 8.89(57) MeV (first proton)Half-life:160 nsDecay constant λ:4332169.8784997 s-1Specific activity α:1.291531546410 × 10+28 Bq g-1
3.490625801110 × 10+17 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:2009
Radioactive Decay
Half-life T½ = 160 ns respectively 1.6 × 10-7 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 203Pt | ? | 4.94(45) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 126) and isobaric (same nucleon number A = 203) with Iridium-203. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 126 | Isobar A = 203 |
|---|
| 76 | 202Os | 203Os |
| 77 | 203Ir | 203Ir |
| 78 | 204Pt | 203Pt |
| 79 | 205Au | 203Au |
| 80 | 206Hg | 203Hg |
| 81 | 207Tl | 203Tl |
| 82 | 208Pb | 203Pb |
| 83 | 209Bi | 203Bi |
| 84 | 210Po | 203Po |
| 85 | 211At | 203At |
| 86 | 212Rn | 203Rn |
| 87 | 213Fr | 203Fr |
| 88 | 214Ra | 203Ra |
| 89 | 215Ac | 203Ac |
| 90 | 216Th | |
| 91 | 217Pa | |
| 92 | 218U | |
| 93 | 219Np | |
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-203
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