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Q.

X is an element contains 6 valence electrons the possible element is

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a

Nitrogen

b

Oxygen

c

Sodium

d

Aluminium

answer is A.

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Detailed Solution

The valence electrons in the given compounds are

Elements	Atomic no	Electronic configuration	No. of valence $e^{-}$
Oxygen	$Z = 8$	$1 s^{2} 2 s^{2} 2 p^{4}$	6
Nitrogen	$Z = 7$	$1 s^{2} 2 s^{2} 2 p^{3}$	5
Sodium	$Z = 11$	$1 s^{2} 2 s^{2} 2 p^{6} {3s}^{1}$	1
Aluminium	$Z = 13$	$1 s^{2} 2 s^{2} 2 p^{6} {3s}^{2} {3p}^{1}$	3

Therefore the element is oxygen.

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