Chapter 9, Problem 28E

Interpretation Introduction

Interpretation:

The periodic trend in each chemical property is to be explained.

Concept introduction:

The periodic trends like, ionization energy, atomic size, metallic character can be explained by the quantum mechanical models.

On going from top to bottom, the principal quantum number $(n)$ increases because the shell number increases.

On going from left to right across the periodic table, the principal quantum number $(n)$ remains same and the number of electrons and nuclear charge increases.