Structure of Atom - Result Question 54
####58. Which of the following species has four lone pairs of electrons?
[1993]
(a) I
(b) $O^{-}$
(c) $Cl^{-}$
(d) $He$
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Solution:
- (c) Outer electronic configuration of $Cl$ $=3 s^{2} 3 p_x^{2} 3 p_y^{2} 3 p_z{ }^{1}$
Outer electronic configuration of $Cl^{-}=3 s^{2} 3 p_x^{2} 3 p_y{ }^{2} 3 p_z{ }^{2}$
hence, $Cl^{-}$contains four lone pairs of electrons.
