Osmium-200

Properties and data of the isotope ²⁰⁰Os.

Contents

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

General data

Name of the isotope:Osmium-200; Os-200Symbol:²⁰⁰Os or 20076OsMass number A:200 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:124Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.6315789473684 (= neutron-proton ratio)Neutron excess (N-Z):48Isotopic mass:199.97984(32) u (atomic weight of Osmium-200)Nuclide mass:199.9381522 u (calculated nuclear mass without electrons)Mass excess:-18.77892 MeVMass defect:1.689312016 u (per nucleus)Nuclear binding energy:1573.58400703 MeV (per nucleus)
7.86792004 MeV (average binding energy per nucleon)Separation energy:S_N = 6.37(36) MeV (first neutron)
S_P = 11.21(50) MeV (first proton)Half-life:6 sDecay constant λ:0.11552453009332 s^-1Specific activity α:3.496004989949 × 10⁺²⁰ Bq g^-1
9448662134.9992 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2005

Radioactive Decay

Half-life T_½ = 6 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰⁰Ir	100 %	2.83(36) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 124) and isobaric (same nucleon number A = 200) with Osmium-200. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 124	Isobar A = 200
75	¹⁹⁹Re
76	²⁰⁰Os	²⁰⁰Os
77	²⁰¹Ir	²⁰⁰Ir
78	²⁰²Pt	²⁰⁰Pt
79	²⁰³Au	²⁰⁰Au
80	²⁰⁴Hg	²⁰⁰Hg
81	²⁰⁵Tl	²⁰⁰Tl
82	²⁰⁶Pb	²⁰⁰Pb
83	²⁰⁷Bi	²⁰⁰Bi
84	²⁰⁸Po	²⁰⁰Po
85	²⁰⁹At	²⁰⁰At
86	²¹⁰Rn	²⁰⁰Rn
87	²¹¹Fr	²⁰⁰Fr
88	²¹²Ra
89	²¹³Ac
90	²¹⁴Th
91	²¹⁵Pa
92	²¹⁶U