The only lighter metals are the metals of groups 1 and 2, which apart from beryllium and magnesium are too reactive for structural use (and beryllium is very toxic).[25] Aluminium is not as strong or stiff as steel, but the low density makes up for this hinein the aerospace industry https://beauwelqw.jts-blog.com/26341579/neue-schritt-für-schritt-karte-für-me