Kossel-Lewis Approach To Chemical Bonding
Chapter Name : Chemical Bonding And Molecular Structure |
Sub Topic Code : 102_11_04_02_03 |
Topic Name : Kossel-Lewis Approach To Chemical Bonding |
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Sub Topic Name : Covalent Bond |
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Introduction
• Langmuir (1919) refined the Lewis Postulations and introduced the term covalent bond. • The formation of the Cl2 molecule takes place by sharing of a pair of electrons between the two chlorine atoms. • Depending on the number of electron pairs shared between the atoms, the bonds can be single (one pair), double (two pairs) or triple bonds (3 pairs).
Pre-Requisites:
Matter, noble gases, molecules, atoms, periodic table, chemical bond, octet rule
Activity:
All matter, piece of wood, bucket, chalk, universe are all composed of molecules.
Real Life Question:
How does matter form?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Electrostatic bond | • The bond formed, as a result of the electrostatic attraction between the positive and negative ions was termed as the electrovalent bond. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Magnet and iron object | See how attractive forces exist between the magnet and the iron object. Similarly a chemical bond is formed between two atoms. |
Real life uses :
Bonding helps to bring stability, stable octet in case of chemical species.
Places to visit :
Kitchen, garage, park, garden
Practical examples around us
| Examples | Explainations |
|---|---|
| Wood, water, salt | All matter is made up of molecules. Molecules are made from atoms by chemical bonding. |
What you learn in Theory:
Chemical bonding takes place as all atoms want to attain a stable octet in their valence shell configuration.
What you learn in Practice:
Chemical bonding helps to make different types of substances. Bonding takes place as all elements attempt to get a stable octet in their valence shells.