Chapter 7, Problem 90QRT

(a)

Interpretation Introduction

Interpretation:

Name of an element which can be a central atom for ${\text{XH}}_3$ molecule with one lone pair of electrons has to be given from group 1A to 8A.

(b)

Interpretation Introduction

Interpretation:

Name of an element which can be a central atom for ${\text{XCl}}_3$ molecule with no lone pair of electrons has to be given from group 1A to 8A.

(c)

Interpretation Introduction

Interpretation:

Name of an element which can be a central atom for ${\text{XF}}_5$ molecule has to be given from group 1A to 8A.

(d)

Interpretation Introduction

Interpretation:

Name of an element which can be a central atom for ${\text{XCl}}_3$ molecule with two lone pair of electrons has to be given from group 1A to 8A.