Chapter 8.2, Problem 8SP

(a)

Interpretation Introduction

Interpretation: The electron dot structure for ${\mathrm{H}}_2{O}_2$ needs to be drawn.

Concept Introduction: An electron dot structure represents the arrangement of total valence electrons in a molecule. Here, electrons are represented as dots in pairs to show the lone pairs as well as the bond pairs.

Explanation of Solution

The given molecule is ${\mathrm{H}}_2{O}_2$. There are 2 hydrogen and 2 oxygen atoms in the molecule. It is given that the molecule has single covalent bonds. The number of valence electrons in H and O atoms is 1 and 6 respectively; thus, the electron dot structure can be represented as follows:

  

(b)

Interpretation Introduction

Interpretation: The electron dot structure for ${\text{PCl}}_{\text{3}}$ needs to be drawn.

Concept Introduction: An electron dot structure represents the arrangement of total valence electrons in a molecule. Here, electrons are represented as dots in pairs to show the lone pairs as well as the bond pairs.

Explanation of Solution

The given molecule is ${\text{PCl}}_{\text{3}}$. There is 1 phosphorus atom and 3 chlorine atoms in the molecule. Here, the molecule has single covalent bonds. The number of valence electrons in P and Cl atoms is 5 and 7 respectively; thus, the electron dot structure can be represented as follows: