Chapter 14, Problem 14.18P

(a)

Interpretation Introduction

Interpretation:

Lower densities of the group $\text{1A}\left(\text{1}\right)$ elements has to be explained account on their atomic properties.

Concept Introduction:

Density:

Density is given by,

    $\text{Density}\text{=}\frac{\text{Mass}\text{(g)}}{\text{Volume}\text{(ml)}}$

(b)

Interpretation Introduction

Interpretation:

Trend of Ionic size of group $\text{1A}\left(\text{1}\right)$ elements has to be explained

Concept Introduction:

Ionic radius:

The distance between centres of the nucleus to outer most electron in the ion is known as ionic radius.

(c)

Interpretation Introduction

Interpretation:

Trend of $\text{E-E}$ bond energy of group $\text{1A}\left(\text{1}\right)$ elements has to be explained

Concept Introduction:

Bond dissociation energies:

The energy required to break the bond is known as bond dissociation energy.

(d)

Interpretation Introduction

Interpretation:

Trend of $\text{E-E}$ bond energy of group $\text{1A}\left(\text{1}\right)$ elements has to be explained

Concept Introduction:

Ionization energy:

The required energy to remove an electron from the outermost electron from a neutral atom is known as ionization energy.

  $\text{Ionization energy}\text{=}\frac{\text{1}}{\text{Atomic}\text{size}}$

(e)

Interpretation Introduction

Interpretation:

The magnitude of ${\text{ΔH}}_{\text{hydr}}$ of ${\text{E}}^{\text{+}}$ ion of group $\text{1A}\left(\text{1}\right)$ elements has to be explained

Concept Introduction:

Enthalpy of hydration:

The required energy to dissolve the ionic compound into water is known as enthalpy of hydration.

In periodic table enthalpy of hydration is up to down decreases.

  $\text{Enthalpy of hydration}\text{=}\frac{\text{1}}{\text{Atomic}\text{size}}$