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Bond Parameters
Chapter Name : Chemical Bonding And Molecular Structure
Sub Topic Code : 102_11_04_04_05
Topic Name : Bond Parameters
Sub Topic Name : Resonance Structures
Introduction

• According to the concept of resonance, whenever a single Lewis structure cannot describe a molecule accurately, a number of structures with similar energy, positions of nuclei, bonding and non-bonding pairs of electrons are taken as the canonical structures of the hybrid which describes the molecule accurately.

Pre-Requisites:

Chemical bond, ionic bond, Lewis structures

Activity:

Children playing with a skipping rope.

Real Life Question:

Do covalent molecules have stable structures?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Resonance Whenever a single Lewis structure cannot describe a molecule accurately, a number of structures with similar energy, positions of nuclei, bonding and non-bonding pairs of electrons are taken as the canonical structures of the hybrid which describes the molecule accurately.
Learning aids / Gadgets
Gadgets How it can be used
Skipping rope When the skipping rope spins. It’s difficult to tell the exact location of the rope at any point of time
Real life uses :

Helps to explain the varying structures of molecules.

Places to visit :

Playground, home,

Practical examples around us
Examples Explainations
Skipping rope, drilling A person’s body vibrates so fast that the overall body resonates.
What you learn in Theory:

Resonance describes the accurate structure of molecules.

What you learn in Practice:

Some covalent molecules have resonating structures.

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