Osmium-190

Properties and data of the isotope ¹⁹⁰Os.

Contents

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

General data

Name of the isotope:Osmium-190; Os-190Symbol:¹⁹⁰Os or 19076OsMass number A:190 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:114Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):38Isotopic mass:189.95844(2) u (atomic weight of Osmium-190)Nuclide mass:189.9167522 u (calculated nuclear mass without electrons)Mass excess:-38.71289 MeVMass defect:1.624062856 u (per nucleus)Nuclear binding energy:1512.80480599 MeV (per nucleus)
7.96213056 MeV (average binding energy per nucleon)Separation energy:S_N = 7.79234(19) MeV (first neutron)
S_P = 8.018(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4062(13) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ¹⁹⁰Ir, ¹⁹⁰Re.

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
^190mOs	1705.4(2) keV	9.9(1) min	(10)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 114) and isobaric (same nucleon number A = 190) with Osmium-190. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 114	Isobar A = 190
70	¹⁸⁴Yb
71	¹⁸⁵Lu
72	¹⁸⁶Hf	¹⁹⁰Hf
73	¹⁸⁷Ta	¹⁹⁰Ta
74	¹⁸⁸W	¹⁹⁰W
75	¹⁸⁹Re	¹⁹⁰Re
76	¹⁹⁰Os	¹⁹⁰Os
77	¹⁹¹Ir	¹⁹⁰Ir
78	¹⁹²Pt	¹⁹⁰Pt
79	¹⁹³Au	¹⁹⁰Au
80	¹⁹⁴Hg	¹⁹⁰Hg
81	¹⁹⁵Tl	¹⁹⁰Tl
82	¹⁹⁶Pb	¹⁹⁰Pb
83	¹⁹⁷Bi	¹⁹⁰Bi
84	¹⁹⁸Po	¹⁹⁰Po
85	¹⁹⁹At	¹⁹⁰At
86	²⁰⁰Rn
87	²⁰¹Fr
88	²⁰²Ra
89	²⁰³Ac