Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 6
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40Molecules Where Central Atom Has One Or More Lone Pairs
A central atom with lone pairs has three types of repulsive forces
lone - pair vs.
lone - pair vs.
bonding - pair vs.
lone - pair
>
bonding - pair
>
bonding - pair
repulsion
repulsion
repulsion
– bonding pairs: takes up less space than lone pairs since held by attractive forces
exerted by nuclei of two bonded atoms
– lone pairs: take up more space than bonding-pair
# of Outer
# of Lone Pairs
General
Molecular Shape
Original Shape
Atoms
on Central Atom
Formula
and Name
AB
E
2
2
1
bent or angular
SN=3
AB
E
3
1
3
trigonal pyramidal
Tetrahedral
SN=4
AB
E
2
2
2
2
bent or angular
CHEM
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C hapter
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