Osmium-168
Properties and data of the isotope 168Os.
See also: List of individual Osmium isotopes (and general data sources).
General data
Name of the isotope:Osmium-168; Os-168Symbol:168Os or 16876OsMass number A:168 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:92Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2105263157895 (= neutron-proton ratio)Neutron excess (N-Z):16Isotopic mass:167.967799(11) u (atomic weight of Osmium-168)Nuclide mass:167.9261112 u (calculated nuclear mass without electrons)Mass excess:-29.99504 MeVMass defect:1.424075704 u (per nucleus)Nuclear binding energy:1326.51797382 MeV (per nucleus)
7.89594032 MeV (average binding energy per nucleon)Separation energy:SN = 11.56(7) MeV (first neutron)
SP = 2.45(4) MeV (first proton)Half-life:2.1(1) sDecay constant λ:0.33007008598093 s-1Specific activity α:1.190256617621 × 10+21 Bq g-1
32169097773.565 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1977
Radioactive Decay
Half-life T½ = 2.1(1) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 164W | 43(4) % | 5.8156(27) MeV | |
| EC/β+ | 168Re | 57(4) % | 5.80(3) MeV | |
Parent Nuclides
Direct parent isotope is: 172Pt.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 168) with Osmium-168. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 92 | Isobar A = 168 |
|---|
| 53 | 145I | |
| 54 | 146Xe | |
| 55 | 147Cs | |
| 56 | 148Ba | |
| 57 | 149La | |
| 58 | 150Ce | |
| 59 | 151Pr | |
| 60 | 152Nd | |
| 61 | 153Pm | |
| 62 | 154Sm | |
| 63 | 155Eu | 168Eu |
| 64 | 156Gd | 168Gd |
| 65 | 157Tb | 168Tb |
| 66 | 158Dy | 168Dy |
| 67 | 159Ho | 168Ho |
| 68 | 160Er | 168Er |
| 69 | 161Tm | 168Tm |
| 70 | 162Yb | 168Yb |
| 71 | 163Lu | 168Lu |
| 72 | 164Hf | 168Hf |
| 73 | 165Ta | 168Ta |
| 74 | 166W | 168W |
| 75 | 167Re | 168Re |
| 76 | 168Os | 168Os |
| 77 | 169Ir | 168Ir |
| 78 | 170Pt | 168Pt |
| 79 | 171Au | |
| 80 | 172Hg | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/osmium-168
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