اذا لم تجد ما تبحث عنه يمكنك استخدام كلمات أكثر دقة.
العُنْصُرُ التَّاسِعَ عَشَر:- a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite (Arabic WordNet)