Chapter 1, Problem 1.20CP

(a)

Interpretation Introduction

Interpretation:

The place of alkali metals in the periodic table has to be indicated

Explanation of Solution

The alkali metals are indicated in pink color in the periodic table.

Figure-1

The first group metals are called as alkali metals.  Generally it’s more reactive in nature.

(b)

Interpretation Introduction

Interpretation:

The place of halogens in the periodic table has to be indicated

Explanation of Solution

The Halogens are indicated in red color in the periodic table.

Figure-2

The $\text{17th}$ group elements are called as halogens.

(c)

Interpretation Introduction

Interpretation:

The place of alkaline metals in the periodic table has to be indicated

Explanation of Solution

The alkaline earth metals are indicated in green color in the periodic table.

Figure-3

The second group metals are called as alkaline earth metals.  Generally it’s second most reactive in nature.

(d)

Interpretation Introduction

Interpretation:

The place of transition metals in the periodic table has to be indicated

Explanation of Solution

The transition elements can be indicated using pink color in the periodic table.

Figure-4

The $\text{3-12}$ group’s metals called as transition elements.  It is present in between s and p-block elements.

(e)

Interpretation Introduction

Interpretation:

The place of Hydrogen in the periodic table has to be indicated

Explanation of Solution

The Hydrogen atom is indicated in red color in the periodic table.

Figure-5

The first group and first element called as Hydrogen atom in the periodic table.

(f)

Interpretation Introduction

Interpretation:

The place of helium in the periodic table has to be indicated

Explanation of Solution

The Helium element can be indicated using blue color in the periodic table.

Figure-6

The ${\text{18}}^{\text{th}}$ group first element called as Helium element.  It’s also called noble gas