This document contains a presentation by Sandeep Kumar on the effect of atomic structure of solids on their properties. It discusses the differences between crystalline and amorphous solids. Crystalline solids have a defined geometric atomic arrangement, which gives them sharp melting points and anisotropic properties. Amorphous solids lack a defined structure, resulting in non-sharp melting points and isotropic properties. The document also discusses how close atomic packing in solids increases density, hardness, and mass by restricting atomic motion and fixing volume. The atomic packing factor is an important determinant of solid properties.

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• SANDEEP KUMAR
• B.TECH – MECHANICAL ENGINEERING
• 4th SEM
• CLASS ROLL NO. - 20ME012
• SUBJECT – METERIAL SCIENCE ENGINEERING
• PRESENTATION ON TOPIC- EFFECT OF ATOMIC STRUCTURE OF
SOLIDS ON ITS PROPERTIES
• SUBMITTED TO – SHAKSHI SHARMA

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• Intro
• Solids
• Crystalline & Amorphous
• Different properties of solids
• Effect of structural changes on properties
CONTENTS

4. EFFECT OF ATOMIC STRUCTURE
ON PROPERTIES OF SOLIDS
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WHAT ARE SOLIDS
Solid is one of the four fundamental states of matter.
Have particular shape, size and volume & also rigid and
incomprehensible.

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WHAT MAKE THEM SOLID
• Structural difference.
• Atomic packing factor etc.

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The manner in which atoms,ions etc arranged
effects the properties of solids.
Structural difference can determine whether
the material is crystalline or amorphous, its
will be hard or ductile.

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STRUCTURAL DIFFERENCE
Difference in structure of atoms can control the properties
When atoms are arranged
in definite geometry they
form crystalline solids
When atoms are not arranged
in definite geometry they form
amorphous solids

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CRYSTALLINE:- The structure of crystalline solids made its melting point sharp
Due to its structural arrangment.
These are anisotropic.
Have sharp edges when cutted with knife or any cutter.
AMORPHOUS:- Due to different structure of amorphous solids
Doesn’t have a sharp melting point.
These are isotropic
Doesn’t have sharp edges when cutted with knife or any cutter.

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ATOMIC PACKING
FACTOR
• In Solids Atoms are very closely packed in small area. Due to which
• Density increases.
• Hardness increases.
• Mass increases.
• Also due to close packing atoms can do only vibrational motion &
again return to their mean position
• That’s why their volume is fixed
• Atoms can’t do rotational motion or translation motion

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ATOMIC PACKING
FACTOR
• Atomic packing factor is also very important factor which decide
properties of solids
• In solids INTERMOLECULAR FORCE OF ATTRACTION are very
strong
• Due to which solids have definet shape & size.
• Due to which matter can’t flow in solids.
• Due to which their volume is fixed.

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https://opentextbc.ca/chemistry/chapter/10-5-the-solid-state-of-matter/
https://opentextbc.ca/chemistry/chapter/10-5-the-solid-state-of-matter/
https://www.chem.purdue.edu/gchelp/liquids/character.html
https://www.google.co.in/search?client=ms-opera-
mobile&channel=new&espv=1&biw=360&bih=624&tbm=isch&sa=1&q=crystalli
ne+structure&oq=crystalline+structure&aqs=mobile-gws-lite..0l5#imgrc=DXRQ-
f0q-mdbwM

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