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Atomic: M.A.C. | Reference
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Isotopes of Argon
Notable Isotopes
36Ar [18 neutrons]
Abundance: 0.337%
Stable with 18 neutrons
37Ar [19 neutrons]
Abundance: synthetic
Half life: 35 days [ Electron Capture ]
Decay Energy: unknownMeV
Decays to 37Cl.
37Ar is created from the decay of 40Ca as a result of subsurface nuclear explosions. It has a half-llife of 35 days.
38Ar [20 neutrons]
Abundance: 0.063%
Stable with 20 neutrons
39Ar [21 neutrons]
Abundance: synthetic
Half life: 269 years [ beta- ]
Decay Energy: 0.565MeV
Decays to 39K.
In the Earth's atmosphere, 39Ar is made by cosmic ray activity, primarily with 40Ar.
42K [24 neutrons]
Abundance: synthetic
Half life: 32.9 years [ beta- ]
Decay Energy: 0.600MeV
Decays to 42K.