Platinum-172

Properties and data of the isotope ¹⁷²Pt.

Content

General data

Name of the isotope:Platinum-172; Pt-172Symbol:¹⁷²Pt or 17278PtMass number A:172 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:94Isotopic mass:171.977341(11) u (atomic weight of Platinum-172)Nuclide mass:171.9345563 u (calculated nuclear mass without electrons)Mass excess:-21.10672 MeVMass defect:1.4475136 u (per nucleus)Nuclear binding energy:1348.35023332 MeV (per nucleus)
7.83924554 MeV (average binding energy per nucleon)Separation energy:S_N = 11.71(7) MeV (first neutron)
S_P = 1.98(4) MeV (first proton)Half-life:97.6(13) msDecay constant λ:7.101917833606 s^-1Specific activity α:2.501096466062 × 10⁺²² Bq g^-1
675972017854.78 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1981

Radioactive Decay

Half-life T_½ = 97.6(13) ms respectively 9.76 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁸Os	94(6) %	6.463(4) MeV
EE/β⁺	¹⁷²Ir	6(6) %	6.27(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷⁶Hg.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 94) and isobaric (same nucleon number A = 172) with Platinum-172. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 94	Isobar A = 172
54	¹⁴⁸Xe
55	¹⁴⁹Cs
56	¹⁵⁰Ba
57	¹⁵¹La
58	¹⁵²Ce
59	¹⁵³Pr
60	¹⁵⁴Nd
61	¹⁵⁵Pm
62	¹⁵⁶Sm
63	¹⁵⁷Eu
64	¹⁵⁸Gd
65	¹⁵⁹Tb	¹⁷²Tb
66	¹⁶⁰Dy	¹⁷²Dy
67	¹⁶¹Ho	¹⁷²Ho
68	¹⁶²Er	¹⁷²Er
69	¹⁶³Tm	¹⁷²Tm
70	¹⁶⁴Yb	¹⁷²Yb
71	¹⁶⁵Lu	¹⁷²Lu
72	¹⁶⁶Hf	¹⁷²Hf
73	¹⁶⁷Ta	¹⁷²Ta
74	¹⁶⁸W	¹⁷²W
75	¹⁶⁹Re	¹⁷²Re
76	¹⁷⁰Os	¹⁷²Os
77	¹⁷¹Ir	¹⁷²Ir
78	¹⁷²Pt	¹⁷²Pt
79	¹⁷³Au	¹⁷²Au
80	¹⁷⁴Hg	¹⁷²Hg