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Number Of Atoms In A Unit cell
Chapter Name : The Solid State
Sub Topic Code : 102_12_01_06_02
Topic Name : Number Of Atoms In A Unit cell
Sub Topic Name : Body Centered Cubic Unit Cell
Introduction

• A body centred unit cell contains 1 constituent particle at the centre and the rest at the corners. • Each corner of a body centred unit cell contains only 1/8th of a particle and the centre contains 1 whole particle. • The total number of constituent particles (say atom) in a body centred unit cell = 2. . .

Pre-Requisites:

• Crystal lattice and unit cell. • Types of unit cells.

Activity:

All properties of a solid depend on its structure. Try finding out which elements are made up of body centered unit cell.

Real Life Question:

How many atoms does one body centered unit cell contain?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Crystal lattice It is a regular 3D arrangement of points in space.
Unit cell It is the smallest portion of a crystal lattice.
Lattice point Each point of a lattice is called a lattice point and contains 1 constituent particle (e.g. molecule, atom, and ion).
Body centered unit cell A unit cell which contains 1 constituent particle at the center and the rest at the corners.
Learning aids / Gadgets
Gadgets How it can be used
Practical examples around us
Examples Explainations
Sodium element It consists of a body centered unit cell structure.
What you learn in Theory:

The number of atoms in a body centered unit cell.

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