Osmium-172
Properties and data of the isotope 172Os.
See also: list of Osmium isotopes.
General data
Name of the isotope:Osmium-172; Os-172Symbol:172Os or 17276OsMass number A:172 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:96Isotopic mass:171.960017(14) u (atomic weight of Osmium-172)Nuclide mass:171.9183292 u (calculated nuclear mass without electrons)Mass excess:-37.24392 MeVMass defect:1.466517368 u (per nucleus)Nuclear binding energy:1366.05212919 MeV (per nucleus)
7.94216354 MeV (average binding energy per nucleon)Separation energy:SN = 11.013(22) MeV (first neutron)
SP = 3.28(3) MeV (first proton)Half-life:19.2(9) sDecay constant λ:0.036101415654164 s-1Specific activity α:1.271390703581 × 10+20 Bq g-1
3436191090.7619 Ci g-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1971
Radioactive Decay
Half-life T½ = 19.2(9) s respectively 1.92 × 101 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
α | 168W | 0.2 % | 5.224(7) MeV | |
EE/β+ | 172Re | 99.8 % | 4.29(4) MeV | |
Parent Nuclides
Direct parent isotopes are: 176Pt, 172Ir.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 172) with Osmium-172. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 96 | Isobar A = 172 |
55 | 151Cs | |
56 | 152Ba | |
57 | 153La | |
58 | 154Ce | |
59 | 155Pr | |
60 | 156Nd | |
61 | 157Pm | |
62 | 158Sm | |
63 | 159Eu | |
64 | 160Gd | |
65 | 161Tb | 172Tb |
66 | 162Dy | 172Dy |
67 | 163Ho | 172Ho |
68 | 164Er | 172Er |
69 | 165Tm | 172Tm |
70 | 166Yb | 172Yb |
71 | 167Lu | 172Lu |
72 | 168Hf | 172Hf |
73 | 169Ta | 172Ta |
74 | 170W | 172W |
75 | 171Re | 172Re |
76 | 172Os | 172Os |
77 | 173Ir | 172Ir |
78 | 174Pt | 172Pt |
79 | 175Au | 172Au |
80 | 176Hg | 172Hg |
81 | 177Tl | |
82 | 178Pb | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/osmium-172
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