Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 10
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40Molecules Where Central Atom Has Lone Pairs (Continued)
# of Outer
# of Lone
General
Atoms
Pairs on
Molecular Geometry
Original Shape
Formula
Central
and Name
Atom
AB
E
4
1
4
<120° and <90°
See-saw
<90°
AB
E
3
2
3
2
T-shaped
180°
Trigonal bipyramidal
AB
E
2
3
2
3
SN=5
Linear
all <90°
AB
E
5
5
1
Square Pyramid
all 90°
AB
E
4
2
4
2
Octahedral
SN=6
Square Planar
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