The geometries of simple cubic unit cell, body-centered cubic unit cell and face-centered cubic unit cell have to be described. The types of unit cells that have highest density and lowest density have to be determined. Concept Introduction: The simplest and basic unit of a crystalline solid is known as unit cell. It is cubic in shape. It is the building block of crystalline solids. The unit cells repeat themselves to build a lattice. Crystalline solids consist of many of such lattices. There are three types of unit cell – simple cubic unit cell, body – centered cubic unit cell and face – centered cubic unit cell. Density of a unit cell depends upon the number of atoms occupied in it.

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Chapter 12, Problem 12.21QP

Interpretation Introduction

Interpretation:

The geometries of simple cubic unit cell, body-centered cubic unit cell and face-centered cubic unit cell have to be described.

The types of unit cells that have highest density and lowest density have to be determined.

Concept Introduction:

The simplest and basic unit of a crystalline solid is known as unit cell. It is cubic in shape. It is the building block of crystalline solids. The unit cells repeat themselves to build a lattice. Crystalline solids consist of many of such lattices. There are three types of unit cell – simple cubic unit cell, body – centered cubic unit cell and face – centered cubic unit cell.

Density of a unit cell depends upon the number of atoms occupied in it.

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