Chapter 6, Problem 66A

Interpretation Introduction

(a)

Interpretation:

Whether the ion is a positive or negative ion needs to be determined.

Concept introduction:

The atomic radius of a particular element is the measure of the atoms size. It can also be defined as the distance between the nucleus of the element to its boundary.

Answer to Problem 66A

A is a negative ion.

Explanation of Solution

An atom forms an anion when it gains an electron. After forming an anion, the atomic size increases. Since, A has greater size than B thus, ion A is a negative ion.

(b)

Interpretation Introduction

Interpretation:

The order of the element in period of the periodic table needs to be determined.

Concept introduction:

Ionic radius can be defined as the radius of the ion in an atom. The atomic radius of a particular element is the measure of the atoms size. It can also be defined as the distance between its boundary and nucleus of the element

Answer to Problem 66A

A is to the left of B on the periodic table.

Explanation of Solution

On moving from left to right across a period, the atomic radius decreases.

From given diagram, it is clear that A has a larger radius. So, A is to the left of B on the periodic table.

(c)

Interpretation Introduction

Interpretation:

The order of the element in group of the periodic table needs to be determined.

Concept introduction:

The atomic radius of a particular element is the measure of the atoms size. It can also be defined as the distance between the nucleus of the element to its boundary.

Answer to Problem 66A

The position of A is below B in the group.

Explanation of Solution

On moving down a group, the atomic or ionic radius increases. From given diagram, A has a larger radius. Hence, A is present at down of B in the group on the periodic table.