Molecular Orbital Theory
Chapter Name : Chemical Bonding And Molecular Structure |
Sub Topic Code : 102_11_04_08_06 |
Topic Name : Molecular Orbital Theory |
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Sub Topic Name : Electronic Configuration And Molecular Behavior |
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Introduction
• The distribution of electrons among various molecular orbitals is called the electronic configuration (EC) of the molecule. • The EC gives important information about the molecule. • Bond order (b.o.) is defined as one half the difference between the number of electrons present in the bonding and the antibonding orbitals.
Pre-Requisites:
Elements, periodic table, bonding and antibonding orbitals
Activity:
Many things in nature are symmetrical…ex: insects, leaves.
Real Life Question:
Why are things having symmetry?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Molecular orbital | Orbitals formed when atomic orbitals combine by hybridisation. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Square piece of paper, circular piece of paper, | Fold the papers and see whether they are symmetrical or not. |
Real life uses :
Symmetry helps to group things.
Places to visit :
Zoo, garden.
Practical examples around us
| Examples | Explainations |
|---|---|
| Leaves, insects | Notice the symmetry in the structure of things for ex: leaves and insects about a single plain or more than one plain. |
What you learn in Theory:
Molecular orbitals are of three types: sigma, pi and delta. The energy levels of molecular orbitals have been determined experimentally from spectroscopic data for homonuclear diatomic molecules of second row elements of the periodic table.
What you learn in Practice:
Electronic configuration leads to the elements different properties.