Chapter 14, Problem 14.33P

Interpretation Introduction

Interpretation:

The unexpected drop in the first ionization energy between groups $2A\left(2\right)$ and $3A\left(13\right)$ in periods $2$  through $4$ has to be explained in the terms of electron configurations and orbital energies.

Concept Introduction:

Ionization energy:

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