All other isotopes of aluminium are radioactive. The most secure of these is 26Al, which has a fifty percent-life of 717,000 many years: whilst it was present together with secure 27Al from the interstellar medium from which the Photo voltaic System formed (believe that to are actually made by stellar nucleosynthesis https://aluminium-greenhouse45566.blog2news.com/38034366/not-known-details-about-sheds-and-garages