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  4. An element 'X' belongs to fourth period and fifteenth group of the Periodic Table. Which one of the following is true ?

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Q. An element 'X' belongs to fourth period and fifteenth group of the Periodic Table. Which one of the following is true ?

KEAMKEAM 2008Classification of Elements and Periodicity in Properties

Solution:

Since the element 'X' belongs to fourth period and fifteenth group of Periodic Table, its outer electronic configuration is $ 4s^2 \, 4p^3$
Its complete electronic configuration is $ 1s^2, \, 2s^2, \, 2p^6, \, 3s^2 \, 3p^6, \, 4s^2, \, 2d^{ 10}, \, 4p^3 $Hence, its s. orbital is completely filled while p-orbital is half-filled.