Argon-35

Properties and data of the isotope ³⁵Ar.

Content

General data

Name of the isotope:Argon-35; Ar-35Symbol:³⁵Ar or 3518ArMass number A:35 (= number of nucleons)Atomic number Z:18 (= number of protons)Neutrons N:17Isotopic mass:34.9752577(7) u (atomic weight of Argon-35)Nuclide mass:34.9653834 u (calculated nuclear mass without electrons)Mass excess:-23.0473 MeVMass defect:0.312896448 u (per nucleus)Nuclear binding energy:291.46116393 MeV (per nucleus)
8.32746183 MeV (average binding energy per nucleon)Separation energy:S_N = 12.7403(7) MeV (first neutron)
S_P = 5.8962(7) MeV (first proton)Half-life:1.7756(10) sDecay constant λ:0.3903734965983 s^-1Specific activity α:6.914365248532 × 10⁺²¹ Bq g^-1
186874736446.82 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = + 0.6320(2)Quadrupole moment Q:- 0.084(15) barn (100 fm²)Nuclear g-factor:g_l = 0.42133333333333Charge radius:3.3636(42) femtometer fmMirror nucleus:Chlorine-35Year of discovery:1940

Radioactive Decay

Half-life T_½ = 1.7756(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	³⁵Cl	100 %	5.9662(7) MeV

Parent Nuclides

Direct parent isotopes are: ³⁶Ca, ³⁵K.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 17) and isobaric (same nucleon number A = 35) with Argon-35. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 17	Isobar A = 35
7	²⁴N
8	²⁵O
9	²⁶F
10	²⁷Ne
11	²⁸Na	³⁵Na
12	²⁹Mg	³⁵Mg
13	³⁰Al	³⁵Al
14	³¹Si	³⁵Si
15	³²P	³⁵P
16	³³S	³⁵S
17	³⁴Cl	³⁵Cl
18	³⁵Ar	³⁵Ar
19	³⁶K	³⁵K
20	³⁷Ca	³⁵Ca
21	³⁸Sc
22	³⁹Ti
23	⁴⁰V
24	⁴¹Cr
25	⁴²Mn