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://brooksazvqk.blog-ezine.com/26772695/eine-geheimwaffe-für-jet