VSEPR Theory (Molecular Shapes)
A = the central atom, X = an atom bonded to A, E = a lone pair on A
Note:
There are lone pairs on X or other atoms, but we don't care.
We are interested in only the electron densities or domains around atom A.
Total
Domains
Generic
Formula
Picture
Bonded
Atoms
Lone
Pairs
Molecular
Shape
Electron
Geometry
Example
Hybridi
zation
Bond
Angles
1
AX
1
0
Linear
Linear
H
2
s
180
AX
2
2
0
Linear
Linear
CO
2
2
AXE
1
1
Linear
Linear
CN

sp
180
AX
3
3
0
Trigonal planar
Trigonal planar
AlBr
3
AX
2
E
2
1
Bent
Trigonal planar
SnCl
2
3
AXE
2
1
2
Linear
Trigonal planar
O
2
sp
2
120
AX
4
4
0
Tetrahedral
Tetrahedral
SiCl
4
AX
3
E
3
1
Trigonal pyramid
Tetrahedral
PH
3
AX
2
E
2
2
2
Bent
Tetrahedral
SeBr
2
4
AXE
3
1
3
Linear
Tetrahedral
Cl
2
sp
3
109.5
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document