Chapter 12, Problem 12.90SP

Interpretation Introduction

Interpretation:

The materials in the order of increase in their conductivity should be arranged.

Concept introduction:

According to band theory, solids are classified as conductors, semiconductors, and insulators.

As per band theory, bands are a continuum of energy levels. The bands are of two types: valence band and conduction band.

The band that holds valence electrons is valence band and band that is slightly higher in energy than valence band is conduction band. On the basis of band theory, partly filled band shows conduction and are called conductors, and fully filled band doesn’t show conduction and are insulators.