Chapter 5, Problem 21E

Interpretation Introduction

(a)

Interpretation:

The group number of alkali metals in periodic table is to be identified.

Concept introduction:

The elements in a modern periodic table are arranged in the increasing order of their atomic numbers. In the modern periodic table, the horizontal rows are known as periods, whereas vertical columns are known as groups. There are $7$ periods and $18$ groups in a modern periodic table.

Interpretation Introduction

(b)

Interpretation:

The group number of alkaline earth metals in periodic table is to be identified.

Concept introduction:

The elements in a modern periodic table are arranged in the increasing order of their atomic numbers. In the modern periodic table, the horizontal rows are known as periods, whereas vertical columns are known as groups. There are $7$ periods and $18$ groups in a modern periodic table.

Interpretation Introduction

(c)

Interpretation:

The group number of halogens in periodic table is to be identified.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic number. In the modern periodic table, the horizontal rows are known as periods, whereas vertical columns are known as groups. There are $7$ periods and $18$ groups in a modern periodic table.

Interpretation Introduction

(d)

Interpretation:

The group number of noble gases in periodic table is to be identified.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic number. In the modern periodic table, the horizontal rows are known as periods, whereas vertical columns are known as groups. There are $7$ periods and $18$ groups in a modern periodic table.