Chapter 9, Problem 120QRT

(a)

Interpretation Introduction

Interpretation:

The radius of a lithium atom has to be estimated by assuming that the metal atoms in lithium touch along the body diagonal of the body-centered cubic unit cell.

(b)

Interpretation Introduction

Interpretation:

The radius of an $I^{-}$ ion and of an $L{i}^{+}$ ion have to be calculated by assuming that the $I^{-}$ ions touch along the face diagonal of the body-centered cubic unit cell and that the $L{i}^{+}$ and $I^{-}$ ions touch along the edge of the cube.

(c)

Interpretation Introduction

Interpretation:

A comparison of the results in parts (a) and (b) for the radius of a lithium atom and a lithium ion has to be done.  The assumptions that were made have some error or not has to be explained.