Chapter 4.2, Problem 9PP

a)

Interpretation Introduction

To identify:

The group/ period numbers each of the following elements C, N & O:

b)

Interpretation Introduction

To Identify:

Group begins with Helium.

c)

Interpretation Introduction

To identify:

Alkali elements in the periodic table

d)

Interpretation Introduction

To identify:

Group or period ending with Neon in the periodic table.