Covalent or Network Solids (The Solid State - 7) || Chemistry for Class 12 in Hindi

In this Chemistry video in Hindi for class 11 and class 12 we explained what covalent or network solids are and what their properties are.
This is a topic from the chapter 'The Solid States' for Class 12th Chemistry.
These solids are made up of atoms bonded togather by covalent bond. Covalent bonds are strong and directional in nature, therefore atoms are held very strongly
at their positions. Such solids are very hard and brittle. They have extremely high melting points and may even decompose before melting. They are insulators and do not conduct electricity. Diamond and silicon carbide are typical examples of such solids. Although Graphite also belongs to this class of crystals, but it is soft and is a conductor of electricity. Its exceptional properties are due to its typical structure. Carbon atoms are arranged in different layers and each atom is covalently bonded to three of its neighbouring atoms in the same layer. The fourth valence electron of each atom is present between different layers and is free to move about. These free electrons make graphite a good conductor of electricity. Different layers can slide one over the other. This makes graphite a soft solid and a good solid lubricant.
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🔴 Link for the playlist on the chapter ‘The Solid State’ for Class 12 - Chemistry
• Bravais Lattices and C...
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Previous videos :-
🔴 The Solid State
• The Solid State (Intro...
🔴 Types of Crystalline Solids
• Types of Crystalline S...
🔴 NON POLAR molecular solids and LONDON dispersion forces
• NON POLAR molecular so...
🔴 Polar Molecular Solids and Hydrogen Bonded Molecular Solids
• Video
🔴 Ionic Solids
• Ionic Solids (The Soli...
🔴 Metallic Solids
• Metallic Solids (The S...

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If the graphite atom bonded by three neighborhood carbon atom. But as we know the carbon atom has valency 4. Then how carbon atom is stable. To become stable it requires 8 electrons. But in case of graphite the Carbon atom has only 7 electrons. Please explain sir, how it is possible.

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