Platinum-188

Properties and data of the isotope ¹⁸⁸Pt.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Platinum-188; Pt-188Symbol:¹⁸⁸Pt or 18878PtMass number A:188 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:110Isotopic mass:187.959398(6) u (atomic weight of Platinum-188)Nuclide mass:187.9166133 u (calculated nuclear mass without electrons)Mass excess:-37.82052 MeVMass defect:1.604095256 u (per nucleus)Nuclear binding energy:1494.20510639 MeV (per nucleus)
7.9478995 MeV (average binding energy per nucleon)Separation energy:S_N = 9.207(25) MeV (first neutron)
S_P = 5.561(28) MeV (first proton)Half-life:10.16(18) dDecay constant λ:7.896197649642 × 10^-7 s^-1Specific activity α:2.542888476152 × 10⁺¹⁵ Bq g^-1
68726.715571681 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4053(34) femtometer fmYear of discovery:1954

Radioactive Decay

Half-life T_½ = 10.16(18) d respectively 8.77824 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁸⁸Ir	99.999974(3)	0.524(11) MeV
α	¹⁸⁴Os	0.000026 %	4.007(5) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁸Au.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 188) with Platinum-188. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 110	Isobar A = 188
69	¹⁷⁹Tm
70	¹⁸⁰Yb
71	¹⁸¹Lu	¹⁸⁸Lu
72	¹⁸²Hf	¹⁸⁸Hf
73	¹⁸³Ta	¹⁸⁸Ta
74	¹⁸⁴W	¹⁸⁸W
75	¹⁸⁵Re	¹⁸⁸Re
76	¹⁸⁶Os	¹⁸⁸Os
77	¹⁸⁷Ir	¹⁸⁸Ir
78	¹⁸⁸Pt	¹⁸⁸Pt
79	¹⁸⁹Au	¹⁸⁸Au
80	¹⁹⁰Hg	¹⁸⁸Hg
81	¹⁹¹Tl	¹⁸⁸Tl
82	¹⁹²Pb	¹⁸⁸Pb
83	¹⁹³Bi	¹⁸⁸Bi
84	¹⁹⁴Po	¹⁸⁸Po
85	¹⁹⁵At	¹⁸⁸At
86	¹⁹⁶Rn