Shapes, And Bond Angles Of Molecules Worksheet Page 2
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14To determine the overall shape and bond angle of a molecule by the VSEPR theory the number of bonding and lone pairs of electrons around the
central atom need to be identified.
Number of
Number of
Overall Bond
Number of
Overall Shape
negative
bonding
Angle
Reason for the shape
lone pairs of
(according to
Examples
charge
pairs of
(according to
(according to VSEPR)
electrons
VSEPR)
centers
electrons
VSEPR)
To minimize the repulsion the two
2
2
0
Linear
180°
bonding pairs repel each other
CO
, HCN, BeCl
2
2
equally
To minimize the repulsion the three
3
3
0
Trigonal planar
120°
bonding pairs repel each other
BF
, C
H
3
2
4
equally
To minimize the repulsion the four
4
4
0
Tetrahedral
109.5°
bonding pairs repel each other
CH
, SiCl
, CCl
4
4
4
equally
To minimize the repulsion the lone
pair-lone pair > bonded pair-lone
4
3
1
Trigonal pyramid
107°
NH
, NF
3
3
pair > bonded pair- bonded pair
repulsion
To minimize the repulsion
Lone pair-lone pair > bonded pair-
4
2
2
Bent
104.5°
H
O, H
S
2
2
lone pair > bonded pair- bonded pair
repulsion
bonded pair-lone pair > bonded pair-
> 104.5°
3
2
1
Bent
O
, SO
bonded pair repulsion
3
2
(about 117°)
2
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