elements in terms UI 1, metallic. Ans. NT 00 or F P15 N is non-metal because it has more than 3 electrons in its out Similarly, P is a non-metal. Q. 17. An atom has the electronic configuration 2, 8, 7. (a) What is the atomic number of this element ?

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Qry? electronic contigaration 2,8,7 ( 2+8+7=17 ) no of elgectoon Presentin that atom. We know that 17 electon are cl. eleetronie conbiguration of ( d=15^{circ} 25^{2} 2 p^{6} 3 s^{2}-3 p^{5} ) ( =15^{2} 25^{2} 2 p^{6} 35^{2} underline{3 p^{5}} ) (a) So atonic No ( 13=17 )

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