Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 8
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40AB
E
: T-shaped
3
2
– start with AB
molecule and replace two B atoms with two lone pairs
5
– both B atoms are taken from equatorial positions to maximize distance between the
lone pairs (lp) as well as between the lone pairs (lp) and bonding pairs (bp)
→ bond angles for remaining atoms are now <90°
AB
E
: linear
2
3
– start with AB
molecule and replace three B atoms with three lone pairs
5
– first two B atoms taken from equatorial positions; third B atom taken:
rd
–
from equatorial:
3
lone pair would be ~120° from other lone pairs,
rd
so removing 3
outer atom from equatorial
– bond angle is now 180° position maximizes space between the lone pairs.
CHEM
1 61:
C hapter
9
page
8
o f
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