Platinum-178

Properties and data of the isotope ¹⁷⁸Pt.

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-178; Pt-178Symbol:¹⁷⁸Pt or 17878PtMass number A:178 (= number of nucleons)Atomic number Z:78 (= number of protons)Neutrons N:100Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2820512820513 (= neutron-proton ratio)Neutron excess (N-Z):22Isotopic mass:177.965649(11) u (atomic weight of Platinum-178)Nuclide mass:177.9228643 u (calculated nuclear mass without electrons)Mass excess:-31.99775 MeVMass defect:1.511195096 u (per nucleus)Nuclear binding energy:1407.66916475 MeV (per nucleus)
7.90825373 MeV (average binding energy per nucleon)Separation energy:S_N = 10.698(18) MeV (first neutron)
S_P = 3.239(22) MeV (first proton)Half-life:20.7(7) sDecay constant λ:0.033485371041543 s^-1Specific activity α:1.13928599525 × 10⁺²⁰ Bq g^-1
3079151338.5162 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1966

Radioactive Decay

Half-life T_½ = 20.7(7) s respectively 2.07 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁴Os	7.7(3) %	5.5730(22) MeV
EC/β⁺	¹⁷⁸Ir	92.3(3) %	4.254(22) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁸²Hg, ¹⁷⁹Hg.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 100) and isobaric (same nucleon number A = 178) with Platinum-178. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 100	Isobar A = 178
58	¹⁵⁸Ce
59	¹⁵⁹Pr
60	¹⁶⁰Nd
61	¹⁶¹Pm
62	¹⁶²Sm
63	¹⁶³Eu
64	¹⁶⁴Gd
65	¹⁶⁵Tb
66	¹⁶⁶Dy
67	¹⁶⁷Ho
68	¹⁶⁸Er
69	¹⁶⁹Tm	¹⁷⁸Tm
70	¹⁷⁰Yb	¹⁷⁸Yb
71	¹⁷¹Lu	¹⁷⁸Lu
72	¹⁷²Hf	¹⁷⁸Hf
73	¹⁷³Ta	¹⁷⁸Ta
74	¹⁷⁴W	¹⁷⁸W
75	¹⁷⁵Re	¹⁷⁸Re
76	¹⁷⁶Os	¹⁷⁸Os
77	¹⁷⁷Ir	¹⁷⁸Ir
78	¹⁷⁸Pt	¹⁷⁸Pt
79	¹⁷⁹Au	¹⁷⁸Au
80	¹⁸⁰Hg	¹⁷⁸Hg
81	¹⁸¹Tl	¹⁷⁸Tl
82	¹⁸²Pb	¹⁷⁸Pb