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- Isotopes_of_argon abstract "Argon (Ar) has 24 known isotopes, from 30Ar to 53Ar and 1 isomer (32mAr), three of which are stable, 36Ar, 38Ar, and 40Ar. On Earth, 40Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39Ar with a half-life of 269 years, 42Ar with a half-life of 32.9 years, and 37Ar with a half-life of 35.04 days. All other isotopes have half-lives less than 2 hours, and most less than a minute. The least stable is 30Ar with a half-life shorter than 20 nanoseconds.Naturally occurring p40K with a half-life of 1.248×109 (3) years, decays to stable 40Ar (10.72%) by electron capture and by positron emission, and also transforms to stable 40Ca (89.28%) via beta decay. These properties and ratios are used to determine the age of rocks through potassium-argon dating.Despite trapping of 40Ar in many rocks, it can be released by melting, grinding, and diffusion. Almost all of the argon in the Earth's atmosphere is the product of potassium-40 decay, since 99.6% of Earth atmospheric argon is 40Ar, whereas in the Sun and presumably in primordial star-forming clouds, argon consists of < 15% 38Ar and mostly (85%) 36Ar. Similarly, the ratio of the three isotopes 36Ar: 38Ar: 40Ar in the atmospheres of the outer planets is measured to be 8400: 1600: 1In the Earth's atmosphere, radioactive 39Ar (half-life 269 years) is made by cosmic ray activity, primarily from 40Ar. In the subsurface environment, it is also produced through neutron capture by 39K or alpha emission by calcium. The content of 39Ar in natural argon is measured to be of (8.0±0.6)×10−16 g/g, or (1.01±0.08) Bq/kg of 36, 38, 40Ar. The content of 42Ar (half-life 33 years) in the Earth's atmosphere is lower than 6×10−21 parts per part of 36, 38, 40Ar. In December 2013, 36Argon, in the form of argon hydride, was found in cosmic dust associated with the Crab nebula supernova. This was the first time a noble molecule was detected in outer space.Radioactive 37Ar is a synthetic radionuclide that is created from the neutron spallation of 40Ca as a result of subsurface nuclear explosions. It has a half-life of 35 days.Standard argon atomic mass: 39.948(1) u.".
- Isotopes_of_argon wikiPageExternalLink Ar_iso.htm.
- Isotopes_of_argon wikiPageExternalLink pdf.
- Isotopes_of_argon wikiPageExternalLink atomic-weights_revised05.html.
- Isotopes_of_argon wikiPageExternalLink pdf.
- Isotopes_of_argon wikiPageExternalLink Nubase2003.pdf.
- Isotopes_of_argon wikiPageExternalLink nudat2.
- Isotopes_of_argon wikiPageID "2527062".
- Isotopes_of_argon wikiPageRevisionID "601848869".
- Isotopes_of_argon element "argon".
- Isotopes_of_argon hasPhotoCollection Isotopes_of_argon.
- Isotopes_of_argon heavier "Isotopes of potassium".
- Isotopes_of_argon lighter "Isotopes of chlorine".
- Isotopes_of_argon subject Category:Argon.
- Isotopes_of_argon subject Category:Isotopes_of_argon.
- Isotopes_of_argon subject Category:Lists_of_isotopes_by_element.
- Isotopes_of_argon type Abstraction100002137.
- Isotopes_of_argon type Atom114619225.
- Isotopes_of_argon type Isotope114619658.
- Isotopes_of_argon type IsotopesOfArgon.
- Isotopes_of_argon type Matter100020827.
- Isotopes_of_argon type Part113809207.
- Isotopes_of_argon type PhysicalEntity100001930.
- Isotopes_of_argon type Relation100031921.
- Isotopes_of_argon type Substance100019613.
- Isotopes_of_argon comment "Argon (Ar) has 24 known isotopes, from 30Ar to 53Ar and 1 isomer (32mAr), three of which are stable, 36Ar, 38Ar, and 40Ar. On Earth, 40Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39Ar with a half-life of 269 years, 42Ar with a half-life of 32.9 years, and 37Ar with a half-life of 35.04 days. All other isotopes have half-lives less than 2 hours, and most less than a minute.".
- Isotopes_of_argon label "Argônio-36".
- Isotopes_of_argon label "Isotopen van argon".
- Isotopes_of_argon label "Isotopes de l'argon".
- Isotopes_of_argon label "Isotopes of argon".
- Isotopes_of_argon label "Изотопы аргона".
- Isotopes_of_argon label "نظائر الأرغون".
- Isotopes_of_argon label "アルゴンの同位体".
- Isotopes_of_argon label "氬的同位素".
- Isotopes_of_argon sameAs Isotopes_de_l'argon.
- Isotopes_of_argon sameAs アルゴンの同位体.
- Isotopes_of_argon sameAs Isotopen_van_argon.
- Isotopes_of_argon sameAs Argônio-36.
- Isotopes_of_argon sameAs m.0642x2c.
- Isotopes_of_argon sameAs Q776396.
- Isotopes_of_argon sameAs Q776396.
- Isotopes_of_argon sameAs Isotopes_of_argon.
- Isotopes_of_argon wasDerivedFrom Isotopes_of_argon?oldid=601848869.
- Isotopes_of_argon isPrimaryTopicOf Isotopes_of_argon.