Osmium-187
Properties and data of the isotope 187Os.
See also: list of Osmium isotopes.
General data
Name of the isotope:Osmium-187; Os-187Symbol:187Os or 18776OsMass number A:187 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:111Isotopic mass:186.95575(1) u (atomic weight of Osmium-187)Nuclide mass:186.9140622 u (calculated nuclear mass without electrons)Mass excess:-41.21861 MeVMass defect:1.600758108 u (per nucleus)Nuclear binding energy:1491.09657305 MeV (per nucleus)
7.97377847 MeV (average binding energy per nucleon)Separation energy:SN = 6.2903(5) MeV (first neutron)
SP = 6.5808(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μN) = + 0.06465189(6)Charge radius:5.3933(18) femtometer fmYear of discovery:1931
Parent Nuclides
Direct parent isotopes are: 187Ir, 187Re.
Occurrence
Comparison of the natural Osmium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Osmium
Isotopic mixture | 190.23 u | 100 % | | |
| Isotope 184Os | 183.952489(9) u | 0.02(1) % | 5.6 × 1013 a | 0+ |
| Isotope 186Os | 185.95384(1) u | 1.59(3) % | 2.0(11) × 1015 a | 0+ |
| Isotope 187Os | 186.95575(1) u | 1.96(2) % | stable | 1/2- |
| Isotope 188Os | 187.95584(1) u | 13.24(8) % | stable | 0+ |
| Isotope 189Os | 188.95814(2) u | 16.15(5) % | stable | 3/2- |
| Isotope 190Os | 189.95844(2) u | 26.26(2) % | stable | 0+ |
| Isotope 192Os | 191.96148(2) u | 40.78(19) % | stable | 0+ |
NMR data
Nuclear magnetic properties of the NMR active Nuclide 187Os
Isotope:187Os-NMRQuantity:1.96(2) %Spin:1/2-Nuclearmagnetic moment
μ/μN:+ 0.06465189(6)Nuclear g-factor:gl = 0.12930378Resonance frequency:v0 = 0.9856 at 1 TRelative Sensitivity:0.00001 (H0 = const.)
0.0231 (v0 = const.)
[related to 1H = 1.000]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 111) and isobaric (same nucleon number A = 187) with Osmium-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 111 | Isobar A = 187 |
|---|
| 70 | 181Yb | |
| 71 | 182Lu | 187Lu |
| 72 | 183Hf | 187Hf |
| 73 | 184Ta | 187Ta |
| 74 | 185W | 187W |
| 75 | 186Re | 187Re |
| 76 | 187Os | 187Os |
| 77 | 188Ir | 187Ir |
| 78 | 189Pt | 187Pt |
| 79 | 190Au | 187Au |
| 80 | 191Hg | 187Hg |
| 81 | 192Tl | 187Tl |
| 82 | 193Pb | 187Pb |
| 83 | 194Bi | 187Bi |
| 84 | 195Po | 187Po |
| 85 | 196At | |
| 86 | 197Rn | |
External data and identifiers
Last update: 2020-10-21
Perma link: https://www.chemlin.org/isotope/osmium-187
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