Osmium-198

Properties and data of the isotope ¹⁹⁸Os.

Contents

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

General data

Name of the isotope:Osmium-198; Os-198Symbol:¹⁹⁸Os or 19876OsMass number A:198 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:122Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6052631578947 (= neutron-proton ratio)Neutron excess (N-Z):46Isotopic mass:197.97441(21) u (atomic weight of Osmium-198)Nuclide mass:197.9327222 u (calculated nuclear mass without electrons)Mass excess:-23.83693 MeVMass defect:1.677412184 u (per nucleus)Nuclear binding energy:1562.49938492 MeV (per nucleus)
7.89141103 MeV (average binding energy per nucleon)Separation energy:S_N = 6.60(28) MeV (first neutron)
S_P = 10.62(36) MeV (first proton)Half-life:Spin and parity:
(nuclear angular momentum)0+Year of discovery:2008

Radioactive Decay

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹⁸Ir	100 %	1.98(28) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 122) and isobaric (same nucleon number A = 198) with Osmium-198. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 122	Isobar A = 198
74	¹⁹⁶W
75	¹⁹⁷Re	¹⁹⁸Re
76	¹⁹⁸Os	¹⁹⁸Os
77	¹⁹⁹Ir	¹⁹⁸Ir
78	²⁰⁰Pt	¹⁹⁸Pt
79	²⁰¹Au	¹⁹⁸Au
80	²⁰²Hg	¹⁹⁸Hg
81	²⁰³Tl	¹⁹⁸Tl
82	²⁰⁴Pb	¹⁹⁸Pb
83	²⁰⁵Bi	¹⁹⁸Bi
84	²⁰⁶Po	¹⁹⁸Po
85	²⁰⁷At	¹⁹⁸At
86	²⁰⁸Rn	¹⁹⁸Rn
87	²⁰⁹Fr
88	²¹⁰Ra
89	²¹¹Ac
90	²¹²Th
91	²¹³Pa
92	²¹⁴U