Protactinium-232
Properties and data of the isotope 232Pa.
See also: list of Protactinium isotopes.
General data
Name of the isotope:Protactinium-232; Pa-232Symbol:232Pa or 23291PaMass number A:232 (= number of nucleons)Atomic number Z:91 (= number of protons)Neutrons N:141Isotopic mass:232.038590(8) u (atomic weight of Protactinium-232)Nuclide mass:231.9886757 u (calculated nuclear mass without electrons)Mass excess:35.94635 MeVMass defect:1.895241068 u (per nucleus)Nuclear binding energy:1765.4056834 MeV (per nucleus)
7.60950726 MeV (average binding energy per nucleon)Separation energy:SN = 5.549(8) MeV (first neutron)
SP = 5.158(8) MeV (first proton)Half-life:1.32(2) dDecay constant λ:6.077679403057 × 10-6 s-1Specific activity α:1.577613856325 × 10+16 Bq g-1
426382.12333122 Ci g-1Spin and parity:
(nuclear angular momentum)(2-)Year of discovery:1949
Radioactive Decay
Half-life T½ = 1.32(2) d respectively 1.14048 × 105 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 232U | ca. 100 % | 1.337(7) MeV | |
EC | 232Th | ? | 0.500(8) MeV | |
Parent Nuclides
Direct parent isotope is: 236Np.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 141) and isobaric (same nucleon number A = 232) with Protactinium-232. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 141 | Isobar A = 232 |
83 | 224Bi | |
84 | 225Po | |
85 | 226At | |
86 | 227Rn | |
87 | 228Fr | 232Fr |
88 | 229Ra | 232Ra |
89 | 230Ac | 232Ac |
90 | 231Th | 232Th |
91 | 232Pa | 232Pa |
92 | 233U | 232U |
93 | 234Np | 232Np |
94 | 235Pu | 232Pu |
95 | 236Am | 232Am |
96 | 237Cm | 232Cm |
97 | 238Bk | |
98 | 239Cf | |
99 | 240Es | |
100 | 241Fm | |
External data and identifiers
CAS:15766-06-0InChI Key:XLROVYAPLOFLNU-OUBTZVSYSA-NSMILES:[232Pa]PubChem:ID 177679Adopted Levels, Gammas:NuDat 232Pa
Last update: 2021-03-15
Perma link: https://www.chemlin.org/isotope/protactinium-232
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