Question

Which of the following species has four lone pairs of electrons?

• A. I
• B. O
• C. $C{l}^{-}$
• D. He

Answer 1

The correct option is C $C{l}^{-}$

Outer electronic configuration of $Cl=3s^{2}3p_x^{2}3p_y^{2}3p_z^1,$
Outer electronic configuration of $C{l}^{-}=3s^{2}3p_x^{2}3p_y^{2}3p_z^2,$ i.e., 4 lone pair of electrons.