Question

The value $l$ and m for the last electron in the Cl${}^{-}$ ion are :

• A. 1 and 2
• B. 2 and +1
• C. 3 and - 1
• D. 1 and -1

Answer 1

The correct option is D 1 and -1

The valence shell electronic configuration of chloride ion is $3s^{2}3p^6$. The last electron enters $3p$ atomic orbital. For p orbital, $l=1$ and $m=+1,0or-1$.
Hence, the value $l$ and m for the last electron in the chloride ion are 1 and -1.