Close Packed Structures
Chapter Name : The Solid State |
Sub Topic Code : 102_12_01_07_01 |
Topic Name : Close Packed Structures |
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Sub Topic Name : Close Packed Structures |
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Introduction
• In solids, the constituent particles are close-packed, leaving the minimum vacant space. Close Packing in One Dimension • There is only one way of arranging spheres in a one dimensional close packed structure, that is to arrange them in a row and touching each other. coordination number is 2. Close Packing in Two Dimensions Close Packing in Three Dimensions
Pre-Requisites:
Particles, solids, 3D structure.
Activity:
Sal t and sugar crystals are arranged in 3 dimensional closed packed structures.
Real Life Question:
How are particles of solid arranged?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| coordination number | The number of nearest neighbors of a particle is called its coordination number. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Blocks, marbles | Use marbles or blocks to construct different types of closed pack structures. |
Real life uses :
Close packed structures are seen in variety of different substances, e.g. Salt, sugar.
Places to visit :
Kitchen
Practical examples around us
| Examples | Explainations |
|---|---|
| Salt, sugar crystal | A sugar crystal is compact and 3 dimensional cuboid structure. |
What you learn in Theory:
Close packed structures can be made in various 2D and 3D arrangements.
What you learn in Practice:
Solids have closed packed structures.