Osmium-192

Properties and data of the isotope ¹⁹²Os.

Contents

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

General data

Name of the isotope:Osmium-192; Os-192Symbol:¹⁹²Os or 19276OsMass number A:192 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:116Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5263157894737 (= neutron-proton ratio)Neutron excess (N-Z):40Isotopic mass:191.96148(2) u (atomic weight of Osmium-192)Nuclide mass:191.9197922 u (calculated nuclear mass without electrons)Mass excess:-35.88115 MeVMass defect:1.638352688 u (per nucleus)Nuclear binding energy:1526.11569876 MeV (per nucleus)
7.94851926 MeV (average binding energy per nucleon)Separation energy:S_N = 7.5583(22) MeV (first neutron)
S_P = 8.821(10) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4126(15) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ¹⁹²Ir, ¹⁹²Re.

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+

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^192mOs	2015.40(11) keV	5.9(1) s	(10-)
^192m2Os	4113.8(20) keV	0.19(10) μs	(16+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 116) and isobaric (same nucleon number A = 192) with Osmium-192. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 116	Isobar A = 192
71	¹⁸⁷Lu
72	¹⁸⁸Hf
73	¹⁸⁹Ta	¹⁹²Ta
74	¹⁹⁰W	¹⁹²W
75	¹⁹¹Re	¹⁹²Re
76	¹⁹²Os	¹⁹²Os
77	¹⁹³Ir	¹⁹²Ir
78	¹⁹⁴Pt	¹⁹²Pt
79	¹⁹⁵Au	¹⁹²Au
80	¹⁹⁶Hg	¹⁹²Hg
81	¹⁹⁷Tl	¹⁹²Tl
82	¹⁹⁸Pb	¹⁹²Pb
83	¹⁹⁹Bi	¹⁹²Bi
84	²⁰⁰Po	¹⁹²Po
85	²⁰¹At	¹⁹²At
86	²⁰²Rn
87	²⁰³Fr
88	²⁰⁴Ra
89	²⁰⁵Ac