Osmium-187

Properties and data of the isotope ¹⁸⁷Os.

Contents

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

See also: List of individual Osmium isotopes (and general data sources).

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:111Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4605263157895 (= neutron-proton ratio)Neutron excess (N-Z):35Isotopic 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:S_N = 6.2903(5) MeV (first neutron)
S_P = 6.5808(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = + 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 m_a	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 and parameters of the NMR active Nuclide ¹⁸⁷Os

Isotope:¹⁸⁷Os-NMRQuantity:1.96(2) %Spin:1/2-Nuclearmagnetic moment
μ/μ_N:+ 0.06465189(6)Nuclear g-factor:g_l = 0.12930378Resonance frequency:v₀ = 0.9856 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.00001 (H₀ = const.)
0.0231 (v₀ = const.)

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