Chapter 1, Problem 1.20QP

(a)

Interpretation Introduction

Interpretation: From the given list, the species that is not an element is to be stated.

Concept introduction: When the atoms belonging to different elements are chemically combined in a fixed ratio then it leads to the formation of a compound. But when the atoms of same type are combined together then it leads to the formation of an element.

To determine: If ${\text{I}}_2$ is an element or not.

(b)

Interpretation Introduction

To determine: If ${\text{O}}_{\text{3}}$ is an element or not.

(c)

Interpretation Introduction

To determine: If $\text{ClF}$ is an element or not.

(d)

Interpretation Introduction

To determine: If ${\text{S}}_{\text{8}}$ is an element or not.