Platinum-198

Properties and data of the isotope ¹⁹⁸Pt.

Contents

General data

Name of the isotope:Platinum-198; Pt-198Symbol:¹⁹⁸Pt or 19878PtMass number A:198 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:120Isotopic mass:197.96789(2) u (atomic weight of Platinum-198)Nuclide mass:197.9251053 u (calculated nuclear mass without electrons)Mass excess:-29.91027 MeVMass defect:1.682252416 u (per nucleus)Nuclear binding energy:1567.00803199 MeV (per nucleus)
7.91418198 MeV (average binding energy per nucleon)Separation energy:S_N = 7.5556(21) MeV (first neutron)
S_P = 8.029(20) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.4383(32) femtometer fmYear of discovery:1935

Radioactive Decay

Half-life T_½ = stable.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β^-		?

Parent Nuclides

Direct parent isotope is: ¹⁹⁸Ir.

Occurrence

Comparison of the natural Platinum isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Platinum Isotopic mixture	195.084 u	100 %
Isotope ¹⁹⁰Pt	189.95993(4) u	0.012(2) %	6.5(3) × 10¹¹ a	0+
Isotope ¹⁹²Pt	191.96104(2) u	0.782(24) %	stable	0+
Isotope ¹⁹⁴Pt	193.962681(6) u	32.864(410) %	stable	0+
Isotope ¹⁹⁵Pt	194.964792(6) u	33.775(240) %	stable	1/2-
Isotope ¹⁹⁶Pt	195.964952(6) u	25.211(340) %	stable	0+
Isotope ¹⁹⁸Pt	197.96789(2) u	7.356(130) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 198) with Platinum-198. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 120	Isobar A = 198
73	¹⁹³Ta
74	¹⁹⁴W
75	¹⁹⁵Re	¹⁹⁸Re
76	¹⁹⁶Os	¹⁹⁸Os
77	¹⁹⁷Ir	¹⁹⁸Ir
78	¹⁹⁸Pt	¹⁹⁸Pt
79	¹⁹⁹Au	¹⁹⁸Au
80	²⁰⁰Hg	¹⁹⁸Hg
81	²⁰¹Tl	¹⁹⁸Tl
82	²⁰²Pb	¹⁹⁸Pb
83	²⁰³Bi	¹⁹⁸Bi
84	²⁰⁴Po	¹⁹⁸Po
85	²⁰⁵At	¹⁹⁸At
86	²⁰⁶Rn	¹⁹⁸Rn
87	²⁰⁷Fr
88	²⁰⁸Ra
89	²⁰⁹Ac
90	²¹⁰Th