Argon-52

Properties and data of the isotope ⁵²Ar.

Content

General data

Name of the isotope:Argon-52; Ar-52Symbol:⁵²Ar or 5218ArMass number A:52 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:34Isotopic mass:51.99863(64) u (atomic weight of Argon-52)Nuclide mass:51.9887557 u (calculated nuclear mass without electrons)Mass excess:-1.27615 MeVMass defect:0.43682772 u (per nucleus)Nuclear binding energy:406.90240021 MeV (per nucleus)
7.82504616 MeV (average binding energy per nucleon)Separation energy:S_N = 2.66(85) MeV (first neutron)
S_P = 22.86(92) MeV (first proton)Half-life:620 nsDecay constant λ:1117979.3234838 s^-1Specific activity α:1.320123326375 × 10⁺²⁸ Bq g^-1
3.567900882096 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:2009

Radioactive Decay

Half-life T_½ = 620 ns respectively 6.20 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁵²K	?	15.86(60) MeV
β^-, n	⁵¹K	?	13.16(60) MeV
β^-, 2n	⁵⁰K	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 34) and isobaric (same nucleon number A = 52) with Argon-52. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 34	Isobar A = 52
17	⁵¹Cl
18	⁵²Ar	⁵²Ar
19	⁵³K	⁵²K
20	⁵⁴Ca	⁵²Ca
21	⁵⁵Sc	⁵²Sc
22	⁵⁶Ti	⁵²Ti
23	⁵⁷V	⁵²V
24	⁵⁸Cr	⁵²Cr
25	⁵⁹Mn	⁵²Mn
26	⁶⁰Fe	⁵²Fe
27	⁶¹Co	⁵²Co
28	⁶²Ni	⁵²Ni
29	⁶³Cu
30	⁶⁴Zn
31	⁶⁵Ga
32	⁶⁶Ge
33	⁶⁷As
34	⁶⁸Se
35	⁶⁹Br
36	⁷⁰Kr
37	⁷¹Rb