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 rein the aerospace industry https://near44208.tdlwiki.com/647576/near_keine_weiteren_ein_geheimnis