العربية  

books عنصر خامس والعشرون

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العنصر الخامس عشر (Info)


العُنْصُر الخَامِس عَشَر:- a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms (Arabic WordNet)