Question

question 22 of 25
which molecule or ion has a trigonal planar shape?
a. clo4-
b. pcl5
c. so3
d. h2s

Explanation:

The shape of a molecule or ion is determined by the number of bonding pairs and lone - pairs of electrons around the central atom using VSEPR (Valence - Shell Electron - Pair Repulsion) theory. In $SO_3$, the sulfur atom has 3 bonding pairs and 0 lone pairs of electrons around it, resulting in a trigonal planar shape. $ClO_4^-$ has a tetrahedral shape, $PCl_5$ has a trigonal bipyramidal shape, and $H_2S$ has a bent shape.

Answer:

C. $SO_3$