Iridium-168
Properties and data of the isotope 168Ir.
See also: list of Iridium isotopes.
General data
Name of the isotope:Iridium-168; Ir-168Symbol:168Ir or 16877IrMass number A:168 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:91Isotopic mass:167.97996(6) u (atomic weight of Iridium-168)Nuclide mass:167.9377238 u (calculated nuclear mass without electrons)Mass excess:-18.66714 MeVMass defect:1.41107482 u (per nucleus)Nuclear binding energy:1314.40772838 MeV (per nucleus)
7.82385553 MeV (average binding energy per nucleon)Separation energy:SN = 9.67(6) MeV (first neutron)
SP = -0.55(9) MeV (first proton)Half-life:222 msDecay constant λ:3.1222845971169 s-1Specific activity α:1.125918422074 × 10+22 Bq g-1
304302276236.43 Ci g-1Spin and parity:
(nuclear angular momentum)Year of discovery:1978
Radioactive Decay
Half-life T½ = 222 ms respectively 2.22 × 10-1 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 164Re | ≤ 100 % | 6.381(9) MeV | |
p | 167Os | ? | | |
EC/β+ | 168Os | ? | 11,33(6) 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 |
---|
168Ir | +x keV | 159 ms | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 168) with Iridium-168. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 91 | Isobar A = 168 |
52 | 143Te | |
53 | 144I | |
54 | 145Xe | |
55 | 146Cs | |
56 | 147Ba | |
57 | 148La | |
58 | 149Ce | |
59 | 150Pr | |
60 | 151Nd | |
61 | 152Pm | |
62 | 153Sm | |
63 | 154Eu | 168Eu |
64 | 155Gd | 168Gd |
65 | 156Tb | 168Tb |
66 | 157Dy | 168Dy |
67 | 158Ho | 168Ho |
68 | 159Er | 168Er |
69 | 160Tm | 168Tm |
70 | 161Yb | 168Yb |
71 | 162Lu | 168Lu |
72 | 163Hf | 168Hf |
73 | 164Ta | 168Ta |
74 | 165W | 168W |
75 | 166Re | 168Re |
76 | 167Os | 168Os |
77 | 168Ir | 168Ir |
78 | 169Pt | 168Pt |
79 | 170Au | |
80 | 171Hg | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/iridium-168
© 1996 - 2025 ChemLin