Chapter 10, Problem 76E

Interpretation Introduction

Interpretation:

The molecular geometry of each of the given polyatomic ions or molecules is to be determined.

Concept Introduction: To determine the molecular geometry of a polyatomic ion, consider the total number of electron groups, the number of bonding groups and the number of lone pairs.

While writing the Lewis structure of a covalent molecule these steps are followed:

First, correct skeleton is written for the molecule

Total number of valence electrons are calculated

Distribution of a total number of valence electrons in such a way that it completes the octet configuration of all the constituent atoms.

If any atom lacks the octet configuration the double or triple bonds are added.

For molecules which obey the octet rule must have eight electrons in their valence shell. In the molecule, the total number of electron groups around the central atom is equal to the sum of lone pairs, a single bond, a double bond and triple bond around the central atom. On the basis of electron groups, the molecular geometry is predicted. To determine the geometry of the molecule, follow the following table: