Lesson: VESPR theory
VESPR theory deals with the shape of molecules.
VESPR theory deals with the shape of molecules.
VESPR stands for
VESPR theory deals with the shape of molecules.
VESPR stands for
valance
VESPR theory deals with the shape of molecules.
VESPR stands for
valance
electron
VESPR theory deals with the shape of molecules.
VESPR stands for
valance
electron
shell
VESPR theory deals with the shape of molecules.
VESPR stands for
valance
electron
pair
shell
VESPR theory deals with the shape of molecules.
VESPR stands for
valance
electron
pair
shell
repulsion
V
E
S
P
R
Electron
?
Shell
?
Pair
?
Valence
?
Repulsion
?
VESPR theory counts how many 'groups' of electrons
VESPR theory counts how many 'groups' of electrons
are around the central atom.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
are around the central atom.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
It doesn't matter whether is it single, 
are around the central atom.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
It doesn't matter whether is it single, double, 
are around the central atom.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
It doesn't matter whether is it single, double, or triple
are around the central atom.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
It doesn't matter whether is it single, double, or triple
are around the central atom.
bond.
VESPR theory counts how many 'groups' of electrons
A bond counts as one 'group'
It doesn't matter whether is it single, double, or triple
It still counts as ONE group!
are around the central atom.
bond.
This atom has three bonding groups.
N
This atom has three bonding groups.
1
N
This atom has three bonding groups.
1
N
2
This atom has three bonding groups.
1
N
2
3
This atom also has three bonding groups.
C
This atom also has three bonding groups.
1
C
This atom also has three bonding groups.
1
C
2
This atom also has three bonding groups.
1
C
2
3
How many groups?
1
2
3
4
O
How many groups?
1
2
3
4
N
How many groups?
1
2
3
4
O
How many groups?
1
2
3
4
C
Lone electron pairs also act as 'groups'.
Lone electron pairs also act as 'groups'.
Ne
Lone electron pairs also act as 'groups'.
Each 'pair' acts as a group.
Ne
Lone electron pairs also act as 'groups'.
Each 'pair' acts as a group.
1
Ne
Lone electron pairs also act as 'groups'.
Each 'pair' acts as a group.
1
Ne
2
Lone electron pairs also act as 'groups'.
Each 'pair' acts as a group.
1
Ne
3
2
Lone electron pairs also act as 'groups'.
Each 'pair' acts as a group.
4
1
Ne
3
2
Lone electron pairs also act as 'groups'.
So this atom has 4 electron pair groups.
Each 'pair' acts as a group.
4
1
Ne
3
2
How many electron pair groups?
O
How many electron pair groups?
O
1
2
3
4
The shape of the molecule is determined by
The shape of the molecule is determined by
the number of electron groups on the central atom
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
This atom has 4 electron groups
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
1
This atom has 4 electron groups
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
1
2
This atom has 4 electron groups
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
3
1
2
This atom has 4 electron groups
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
4
N
3
1
2
This atom has 4 electron groups
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
This atom has 4 electron groups
One group of electron pairs
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
1
This atom has 4 electron groups
One group of electron pairs
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
This atom has 4 electron groups
and 3 groups of bonding groups
One group of electron pairs
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
1
This atom has 4 electron groups
and 3 groups of bonding groups
One group of electron pairs
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
N
2
1
This atom has 4 electron groups
and 3 groups of bonding groups
One group of electron pairs
The shape of the molecule is determined by
the type of electron groups on the central atom
the number of electron groups on the central atom
3
N
2
1
This atom has 4 electron groups
and 3 groups of bonding groups
One group of electron pairs
Total groups
P
1
2
3
4
Electron pair groups
Bonding Groups
0
1
2
3
0
1
2
3
Total groups
O
1
2
3
4
Electron pair groups
Bonding Groups
0
1
2
3
0
1
2
3
Be
Total groups
1
2
3
4
Electron pair groups
Bonding Groups
0
1
2
3
0
1
2
3
If a central atom has 3 total groups and 1 electron pair group
If a central atom has 3 total groups and 1 electron pair group
Cl
Sn
Cl
If a central atom has 3 total groups and 1 electron pair group
Cl
Sn
1
Cl
If a central atom has 3 total groups and 1 electron pair group
Cl
Sn
1
2
Cl
If a central atom has 3 total groups and 1 electron pair group
Cl
3
Sn
1
2
Cl
If a central atom has 3 total groups and 1 electron pair group
3 total groups
Cl
3
Sn
1
2
Cl
If a central atom has 3 total groups and 1 electron pair group
3 total groups
Cl
Sn
Cl
If a central atom has 3 total groups and 1 electron pair group
3 total groups
Cl
Sn
1
Cl
If a central atom has 3 total groups and 1 electron pair group
1 electron pair group
3 total groups
Cl
Sn
1
Cl
If a central atom has 3 total groups and 1 electron pair group
1 electron pair group
3 total groups
It has a 'bent' shape
Cl
Sn
1
Cl
If a central atom has 3 total groups and 1 electron pair group
1 electron pair group
3 total groups
It has a 'bent' shape
Cl
Sn
1
Cl
If a central atom has 3 total groups and 1 electron pair group
1 electron pair group
3 total groups
It has a 'bent' shape
Cl
Sn
1
Cl
Sn
If a central atom has 3 total groups and 1 electron pair group
1 electron pair group
3 total groups
It has a 'bent' shape
Cl
Sn
1
Cl
Cl
Sn
Cl
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
2
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
2
Electron
   Pair
Groups
0
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
2
Electron
   Pair
Groups
0
Linear
Shape
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
3
2
Electron
   Pair
Groups
0
Linear
Shape
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
3
2
Electron
   Pair
Groups
0
0
Linear
Shape
Each variation on the number of Total Groups and
    how many of thise groups are electron pair groups
creates a different shape.
Total groups
3
2
Electron
   Pair
Groups
0
0
Trigonal
 Planar
Linear
Shape
Total groups
Total groups
Electron
   Pair
Groups
Total groups
Electron
   Pair
Groups
Shape
Total groups
3
Electron
   Pair
Groups
Shape
Total groups
3
Electron
   Pair
Groups
1
Shape
Total groups
3
Electron
   Pair
Groups
1
Bent
Shape
Total groups
4
3
Electron
   Pair
Groups
1
0
Bent
Tetrahedral
Shape
Total groups
4
4
3
Electron
   Pair
Groups
1
1
0
Trigonal
Pyramidal
Bent
Tetrahedral
Shape
Total groups
4
4
4
3
Electron
   Pair
Groups
2
1
1
0
Trigonal
Pyramidal
Bent
Bent
Tetrahedral
Shape
Total groups
Electron
   Pair
Groups
Shape
Total groups
5
Electron
   Pair
Groups
0
Trigonal
Bipyramidal
Shape
Total groups
5
5
Electron
   Pair
Groups
1
0
See-Saw
Trigonal
Bipyramidal
Shape
Total groups
5
5
5
Electron
   Pair
Groups
2
1
0
T-Structure
See-Saw
Trigonal
Bipyramidal
Shape
Total groups
5
5
5
5
Electron
   Pair
Groups
3
2
1
0
Linear
T-Structure
See-Saw
Trigonal
Bipyramidal
Shape
Total groups
2
3
3
4
4
4
5
5
5
5
Electron Pair    Groups
0
0
1
0
1
2
0
1
2
3
Linear
?
Linear
Trigonal Planar
?
Bent
?
Tetrahedral
?
Trigonal Pyramidal
?
Bent
Trigonal Bipyramidal
?
Seesaw
?
T-Structure
?
Shape
Trigonal Pyramidal
?
Bent
?
T-Structure
?
Linear
?
Trigonal Bipyramidal
?
Trigonal Planar
?
SeeSaw
?
Tetrahedral
?
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