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Molecular Shapes
A Look at the Geometry of Some Molecules
Domains
Sets of electrons that are either bonded or unbonded
VSEPR
Electron pairs (either bonded or unbonded) will attempt to get as far apart from each other as possible.
Valence Shell Repulsion
Theory
PairElectron
1 bonding domain, H2
VSEPR TYPE: A2
Bond Angle: 180°
Shape: Linear
H H
Two bonding domains, CO2
Shape: LinearBond angle: 180°
180° CO O
VSEPR TYPE: AB2
Three bonding domains, BBr3
Shape: trigonal planerBond angle: 120°
120°
BBr Br
Br
VSEPR TYPE: AB3
Four bonding domains, CH4
Shape: tetrahedralBond angle: 109.5°
109.5° CH H
H
H
VSEPR TYPE: AB4
Four domains, NH3
three bonding, one nonbonding
Shape: trigonal pyramidBond angle: <109.5°
<109.5°
NH H
H
VSEPR TYPE: AB3E
Four domains, H2OTwo bonding, two nonbonding
Shape: BentBond angle: <109.5°
<109.5°
OH H
VSEPR TYPE: AB2E2
Sulfur dioxide, SO2
S O
ONumber of domains?
Number of non-bonding domains?Number of bonding domains?
3
21
Angles? 120°
Shape? Bent
Five bonding domains, PF5
Shape: trigonal bipyramidBond angle: ?,?
PFF
F
F
F
Six bonding domains, SF6
Shape: octahedralBond angle: ?,?
SF F
F
F
FF
Other Molecular
Shapes