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  4. An element belongs to Group 15 and third period of the periodic table. Its electonic configuration will be

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Q. An element belongs to Group $15$ and third period of the periodic table. Its electonic configuration will be

WBJEEWBJEE 2011The p-Block Elements - Part2

Solution:

General valence shell electronic configuration of group $15$ elements is $n s^{2} n p^{3}$ and for third period $n=3$. Thus, with electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$, the element is phosphorus.