Draw the best Lewis structure for Cl_3^-. What is the formal charge on the central Cl atom?

Jun 20, 2016

This is an analogue (and isostructural with) linear ${I}_{3}^{-}$ ion.

Explanation:

$\text{No. of electrons} = 3 \times 7 + 1 = 22$ $\text{electrons}$

The central iodine atom has 2 bonding pairs and 3 lone pairs, and there are thus 8 electrons associated with the central iodine. The central iodine thus bears a formal negative charge.