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Tungsten-186

Properties and data of the isotope 186W.


Content

See also: list of Tungsten isotopes.

 

General data

Name of the isotope:Tungsten-186; W-186Symbol:186W or 18674WMass number A:186 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:112Isotopic mass:185.95436(2) u (atomic weight of Tungsten-186)Nuclide mass:185.9137691 u (calculated nuclear mass without electrons)Mass excess:-42.51339 MeVMass defect:1.59516296 u (per nucleus)Nuclear binding energy:1485.88472626 MeV (per nucleus)
7.98862756 MeV (average binding energy per nucleon)
Separation energy:SN = 7.1920(12) MeV (first neutron)
SP = 8.403(14) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
0+Charge radius:5.3743(26) femtometer fmYear of discovery:1930

 

Parent Nuclides

Direct parent isotopes are: 186Re, 186Ta.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Tungsten
Isotopic mixture
183.84 u100 %
Isotope 180W179.94671(2) u0.12(1) %1.8(2) × 1018 a0+
Isotope 182W181.948204(6) u26.50(16) %stable0+
Isotope 183W182.950223(6) u14.31(4) %6.7 × 1020 a1/2-
Isotope 184W183.950931(6) u30.64(2) %stable0+
Isotope 186W185.95436(2) u28.43(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 = 186) with Tungsten-186. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 112Isobar A = 186
70182Yb
71183Lu186Lu
72184Hf186Hf
73185Ta186Ta
74186W186W
75187Re186Re
76188Os186Os
77189Ir186Ir
78190Pt186Pt
79191Au186Au
80192Hg186Hg
81193Tl186Tl
82194Pb186Pb
83195Bi186Bi
84196Po186Po
85197At
86198Rn
87199Fr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 186W

 


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Last update: 2020-10-21


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