Chapter 5, Problem 5.49P

(a)

Interpretation Introduction

Interpretation:

The atoms $\text{Kr,}\text{He,}\text{Ar,}\text{Ne}$ has to be arranged in the order of increasing atomic radius.

Concept Introduction:

Periodic table contains elements in the order of the atomic number.  There is a regular trend in the chemical properties across the period and down the group.  On moving across the period, atomic radius decreases because the electrons are added to the same shell and effective nuclear charge increases.  On moving down the group in periodic table, the atomic radius increases as the electrons are added to the next shell.

(b)

Interpretation Introduction

Interpretation:

The atoms $\text{K,}\text{Na,}\text{Rb,}\text{Li}$ has to be arranged in the order of increasing atomic radius.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

The atoms $\text{Be,}\text{Ne,}\text{F,}\text{N}$ has to be arranged in the order of increasing atomic radius.

Concept Introduction:

Refer part (a).