Osmium-174

Properties and data of the isotope ¹⁷⁴Os.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Osmium-174; Os-174Symbol:¹⁷⁴Os or 17476OsMass number A:174 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:98Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2894736842105 (= neutron-proton ratio)Neutron excess (N-Z):22Isotopic mass:173.957063(11) u (atomic weight of Osmium-174)Nuclide mass:173.9153752 u (calculated nuclear mass without electrons)Mass excess:-39.99556 MeVMass defect:1.4868012 u (per nucleus)Nuclear binding energy:1384.94639699 MeV (per nucleus)
7.95946205 MeV (average binding energy per nucleon)Separation energy:S_N = 10.628(18) MeV (first neutron)
S_P = 3.73(3) MeV (first proton)Half-life:44(4) sDecay constant λ:0.015753345012726 s^-1Specific activity α:5.483749287966 × 10⁺¹⁹ Bq g^-1
1482094402.1531 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1971

Radioactive Decay

Half-life T_½ = 44(4) s respectively 4.4 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁰W	0.020 %	4.87(10) MeV
EC	¹⁷⁴Re	99.98 %	3.68(3) %

Parent Nuclides

Direct parent isotopes are: ¹⁷⁸Pt, ¹⁷⁴Ir.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 174) with Osmium-174. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 98	Isobar A = 174
57	¹⁵⁵La
58	¹⁵⁶Ce
59	¹⁵⁷Pr
60	¹⁵⁸Nd
61	¹⁵⁹Pm
62	¹⁶⁰Sm
63	¹⁶¹Eu
64	¹⁶²Gd
65	¹⁶³Tb
66	¹⁶⁴Dy	¹⁷⁴Dy
67	¹⁶⁵Ho	¹⁷⁴Ho
68	¹⁶⁶Er	¹⁷⁴Er
69	¹⁶⁷Tm	¹⁷⁴Tm
70	¹⁶⁸Yb	¹⁷⁴Yb
71	¹⁶⁹Lu	¹⁷⁴Lu
72	¹⁷⁰Hf	¹⁷⁴Hf
73	¹⁷¹Ta	¹⁷⁴Ta
74	¹⁷²W	¹⁷⁴W
75	¹⁷³Re	¹⁷⁴Re
76	¹⁷⁴Os	¹⁷⁴Os
77	¹⁷⁵Ir	¹⁷⁴Ir
78	¹⁷⁶Pt	¹⁷⁴Pt
79	¹⁷⁷Au	¹⁷⁴Au
80	¹⁷⁸Hg	¹⁷⁴Hg
81	¹⁷⁹Tl
82	¹⁸⁰Pb