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The electronic configurations of three elements, A, Band C are given below. Answer the questions 1 to 4 on the basis of these configurations.
$A 1 s^{2} 2 s^{2} 2 p^{6}$
$B 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$
$C 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 5 p^{5}$
Stable form of A may be represented by the formula :

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$A$

$A_{2}$

$A_{3}$

$A_{4}$

answer is A.

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Detailed Solution

$A 1 s^{2} 2 s^{2} 2 p^{6} \to Neon$

Because "A" is a noble gas, its atoms do not interact with one another and continue to exist alone as the monoatomic compound "A."

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