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Title: Chemistry, geography and economics notes
Description: Notes of chemistry geography and economics in a very simple and easy language also easy to understand.

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Programme

: M
...


Course

: Inorganic Chemistry-I

Course Code

: MCHE-111

Sem

:I

Year

: 2020-21

Unit

:1

Topic

: Stereochemistry and Bonding in Main
Group Compounds

Sub-topic

: VSEPR Theory

Faculty

: Dr
...
chemistry@monad
...
in

VSEPR THEORY(VALENCE SHELL
ELECTRON PAIR
...
This theory predicts molecular

shape and bond angles more accurately
...

The Valence Shell Electron Pair Repulsion Theory abbreviated as VSEPR theory is based on the
premise that there is a repulsion between the pairs of valence electrons in all atoms, and the
atoms will always tend to arrange themselves in a manner in which this electron pair repulsion is
minimalized
...


Postulates of VSEPR Theory:
The postulates of the VSEPR theory are listed below:-1
...

For positive ions, subtract the number of electrons equal to the units of positive charge on
the ion from the valence electrons of the central atom
...
The number of Bond pair = Total number of atoms linked to central atom by single bonds
...
Number of lone pairs = Total number of electron – No of shared pair
The electron pairs around the central atom repel each another and move so far apart from each
another that there are no greater repulsions between them
...





The shape of a molecule with only two atoms is always linear
...

If the central atom is linked to similar atoms and is surrounded by bond pairs of electrons
only, the repulsions between them are similar as a result the shape of the molecule is
symmetrical and the molecule is said to have regular geometry
...
As a result, the shape of the
molecule has an irregular or distorted geometry
...


The following terms are commonly used in discussing the shapes of molecules
...

Lone Pair: This refers to a pair of valence electrons that are not shared with another
atom
...

Electron Pair Geometry: This is the 3-D arrangement of electron pairs around the central atom
of a polyatomic ion or molecule
...

1
...

2
...

3
...

4
...

Finally, look up your molecule on the chart by coordination number and number of atoms
...

Example: PCl5

Once you know PCl5 has five electron pairs, you can identify it on a VSEPR chart as a molecule
with a trigonalbipyramidal molecular geometry
...


VSEPR
Number

Shape of the Molecule

VSEPR Number

2

Linear

2

3

Trigonal Planar

3

Shape& Structure

BeF2

BF3

4

Tetrahedral

4
CH4

5

TrigonalBipyramidal

5
PCl5

6

Octahedral

6
SF6

Limitations of VSEPR Theory:
Some significant limitations of the VSEPR theory include:






This theory fails to explain isoelectronic species (i
...
elements having the same number
of electrons)
...

The VSEPR theory does not shed any light on the compounds of transition metals
...
This is
because the VSEPR theory does not take into account the associated sizes of the
substituent groups and the lone pairs that are inactive
...


REFERENCES
1)
2)
3)
4)
5)
6)

The LibreTexts libraries
“Concise Engg
...
B
...
S
...

chemed
...
purdue
...
toppr
...
J
...
Can
...

Chem
Title: Chemistry, geography and economics notes
Description: Notes of chemistry geography and economics in a very simple and easy language also easy to understand.