Question

A completely filled and half filled orbit is spherically symmetrical. Point out which has spherical symmetry.

• A. $Na$
• B. $C$
• C. $C{l}^{-}$
• D. $S$

Answer 1

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

Atomic number of $Cl=17$, i.e., $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$.
Addition of one electron gives $C{l}^{-}$ with fully filled electronic configuration as $1s^{2}2s^{2}2p^{6}3s^{2}3p^6$.