Argon-32
Properties and data of the isotope 32Ar.
See also: list of Argon isotopes.
General data
Name of the isotope:Argon-32; Ar-32Symbol:32Ar or 3218ArMass number A:32 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:14Isotopic mass:31.9976378(19) u (atomic weight of Argon-32)Nuclide mass:31.9877635 u (calculated nuclear mass without electrons)Mass excess:-2.20038 MeVMass defect:0.2645216 u (per nucleus)Nuclear binding energy:246.40028327 MeV (per nucleus)
7.70000885 MeV (average binding energy per nucleon)Separation energy:SN = 21.60(20) MeV (first neutron)
SP = 2.455(4) MeV (first proton)Half-life:98(2) msDecay constant λ:7.072930413877 s-1Specific activity α:1.374005911125 × 10+23 Bq g-1
3713529489528.9 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:3.3468(62) femtometer fmMirror nucleus:Silicon-32Year of discovery:1977
Radioactive Decay
Half-life T½ = 98(2) ms respectively 9.8 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 32Cl | 64.42(22) % | 11.13475 MeV | |
ε, p | 31S | 35.58(22) % | 9.555 MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 32) with Argon-32. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 14 | Isobar A = 32 |
5 | 19B | |
6 | 20C | |
7 | 21N | |
8 | 22O | |
9 | 23F | |
10 | 24Ne | 32Ne |
11 | 25Na | 32Na |
12 | 26Mg | 32Mg |
13 | 27Al | 32Al |
14 | 28Si | 32Si |
15 | 29P | 32P |
16 | 30S | 32S |
17 | 31Cl | 32Cl |
18 | 32Ar | 32Ar |
19 | 33K | 32K |
20 | 34Ca | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/argon-32
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