This article is supported by WikiProject Elements, which gives a central approach to the
chemical elements and their
isotopes on Wikipedia. Please participate by editing this article, or visit the
project page for more details.ElementsWikipedia:WikiProject ElementsTemplate:WikiProject Elementschemical elements articles
This paper documents the discovery of isotopes 20 and 21.
[1]. It's behind a paywall so I can't make use of it. Maybe helpful for others?
ReykYO!13:48, 3 January 2019 (UTC)reply