Question

a molecule exhibits the trigonal planar shape. how many electron groups exist in the valence shell for the central atom in this molecule?
two
three
four
five
more information is required to answer this question
question 11 (1 point)
the bond angle in co₃²⁻ is expected to be approximately
90 degrees
109.5 degrees
120 degrees
145 degrees
180 degrees

Explanation:

Step1: Recall VSEPR theory

The VSEPR (Valence - Shell Electron - Pair Repulsion) theory states that the shape of a molecule is determined by the repulsion between electron - groups around the central atom. A trigonal planar shape is associated with 3 electron - groups around the central atom.

Step2: Analyze $CO_3^{2 - }$ ion

The $CO_3^{2 - }$ ion has a trigonal planar geometry. In a trigonal planar geometry, the bond angles are 120 degrees.

Answer:

First question: B. Three
Second question: C. 120 degrees