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Osmium-188

Properties and data of the isotope 188Os.


Content

See also: list of Osmium isotopes.

 

General data

Name of the isotope:Osmium-188; Os-188Symbol:188Os or 18876OsMass number A:188 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:112Isotopic mass:187.95584(1) u (atomic weight of Osmium-188)Nuclide mass:187.9141522 u (calculated nuclear mass without electrons)Mass excess:-41.13478 MeVMass defect:1.609333024 u (per nucleus)Nuclear binding energy:1499.08405586 MeV (per nucleus)
7.97385136 MeV (average binding energy per nucleon)
Separation energy:SN = 7.98961(15) MeV (first neutron)
SP = 7.20973(15) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
0+Charge radius:5.3993(11) femtometer fmYear of discovery:1931

 

Parent Nuclides

Direct parent isotopes are: 188Ir, 188Re.

 

Occurrence

Comparison of the natural Osmium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Osmium
Isotopic mixture
190.23 u100 %
Isotope 184Os183.952489(9) u0.02(1) %5.6 × 1013 a0+
Isotope 186Os185.95384(1) u1.59(3) %2.0(11) × 1015 a0+
Isotope 187Os186.95575(1) u1.96(2) %stable1/2-
Isotope 188Os187.95584(1) u13.24(8) %stable0+
Isotope 189Os188.95814(2) u16.15(5) %stable3/2-
Isotope 190Os189.95844(2) u26.26(2) %stable0+
Isotope 192Os191.96148(2) u40.78(19) %stable0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 188) with Osmium-188. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 112Isobar A = 188
70182Yb
71183Lu188Lu
72184Hf188Hf
73185Ta188Ta
74186W188W
75187Re188Re
76188Os188Os
77189Ir188Ir
78190Pt188Pt
79191Au188Au
80192Hg188Hg
81193Tl188Tl
82194Pb188Pb
83195Bi188Bi
84196Po188Po
85197At
86198Rn
87199Fr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 188Os

 


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Last update: 2020-10-21


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