Editing Indium (section)

===Isotopes===
{{Main|Isotopes of indium}}
Indium has 39 known [[isotope]]s, ranging in [[mass number]] from 97 to 135. Only two isotopes occur naturally as [[primordial nuclide]]s: indium-113, the only [[stable isotope]], and indium-115, which has a [[half-life]] of 4.41{{e|14}} years, four orders of magnitude greater than the [[age of the Universe]] and nearly 30,000 times greater than half life of [[thorium-232]].<ref name="Audi">{{NUBASE 2003}}</ref> The half-life of <sup>115</sup>In is very long because the [[beta decay]] to <sup>115</sup>[[tin|Sn]] is [[selection rule|spin-forbidden]].<ref>{{cite journal |last1=Dvornický |first1=R. |last2=Šimkovic |first2=F. |date=13–16 June 2011 |title=Second unique forbidden β decay of <sup>115</sup>In and neutrino mass |journal=AIP Conf. Proc. |volume=1417 |issue=33 |page=33 |doi=10.1063/1.3671032|series=AIP Conference Proceedings |bibcode=2011AIPC.1417...33D }}</ref> Indium-115 makes up 95.7% of all indium. Indium is one of three known elements (the others being [[tellurium]] and [[rhenium]]) of which the stable isotope is less abundant in nature than the long-lived primordial radioisotopes.<ref>{{cite web |url=http://www.ciaaw.org/pubs/Periodic_Table_Isotopes.pdf |title=IUPAC Periodic Table of the Isotopes |date=1 October 2013 |website=ciaaw.org |publisher=[[IUPAC]] |access-date=21 June 2016 |archive-date=14 February 2019 |archive-url=https://web.archive.org/web/20190214115238/http://www.ciaaw.org/pubs/Periodic_Table_Isotopes.pdf |url-status=live }}</ref>

The stablest [[synthetic radioisotope|artificial]] isotope is [[indium-111]], with a half-life of approximately 2.8&nbsp;days. All other isotopes have half-lives shorter than 5 hours. Indium also has 47 meta states, among which indium-114m1 (half-life about 49.51&nbsp;days) is the most stable, more stable than the ground state of any indium isotope other than the primordial. All decay by [[isomeric transition]]. The indium isotopes lighter than <sup>113</sup>In predominantly decay through [[electron capture]] or [[positron emission]] to form [[cadmium]] isotopes, while the indium isotopes heavier than <sup>113</sup>In predominantly decay through beta-minus decay to form tin isotopes.<ref name="Audi" />