Chapter 5, Problem 106QRT

(a)

Interpretation Introduction

Interpretation:

An element with larger first ionization energy between the given electron configuration has to be identified.

Concept Introduction:

Ionization energy:  It is the energy required to remove an electron from an atom in gas phase.  The ionization process of sodium atom in gaseous sate is given by

    ${\text{Na}}_{\text{(g)}}\underset{}{\to }{\text{Na}}^{\text{+}}{}_{\text{(g)}}\text{+}{\text{e}}^{\text{-}}\text{ΔE}\text{=}\text{ionization}\text{energy}$

(b)

Interpretation Introduction

Interpretation:

An element smaller in size between the given electron configuration has to be identified.

Concept Introduction:

Atomic radius:  It is defined as distance between nucleus of atom and electron present in outermost valence shell of the atom.