Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 9
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40From Octahedral
AB
E: square pyramidal (central atom + 5 B atoms make 4-faced pyramid)
5
– start with AB
(octahedral) and replace one B atom with one lone pair
6
– since all six outer positions are identical, doesn't matter which outer atom you take
→ square pyramidal shape
– bond angles are now less than 90°
AB
E
: square planar (central atom + 4 B atoms form square all in 1 plane)
4
2
– start with AB
(octahedral) and replace 2 B atoms with 2 lone pairs
6
– doesn't matter which B atom taken first, second B atom taken 180° away from
it to maximize space between lone pairs
→ square planar shape
– bond angles are now exactly 90° since lone pairs balance each other
CHEM
1 61:
C hapter
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