Ncert Exercises & Solutions

The electronic configurations of the elements A, B, and C are given below.

$A = 1 s^{2} 2 s^{2} 2 p^{6}$
$B = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$
$C = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$

The stable form of A may be represented by the formula: