[1993]
(a) I
(b) $O^{-}$
(c) $Cl^{-}$
(d) $He$
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.
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