Molecular Form, Shape, Bond Angles And Polarity Worksheet Page 2
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32. Count the number of atoms that the central atom connects to.
3. Count the number of lone pairs on the central atom.
4. Use the following table (find the appropriate row) to determine the molecular shape and the bond angles:
Total number of
Electron pair
Number of atoms
Number of lone
Molecular shape
Bond angle of
atoms and lone pairs
arrangement around
connected to the
pairs on the central
atoms connected to
around the central
the central atom
central atom
atom
the central atom
atom
4
Tetrahedral
4
0
Tetrahedral
109°
4
Tetrahedral
3
1
Pyramidal
109°
4
Tetrahedral
2
2
Bent
109°
4
Tetrahedral
1
3
linear
N/A
3
Trigonal planar
3
0
Trigonal planar
120°
3
Trigonal planar
2
1
Bent
120°
3
Trigonal planar
1
2
Linear
N/A
2
Linear
2
0
Linear
180°
2
linear
1
1
Linear
N/A
C. Determining a molecule’s polarity and the direction of its dipole moment.
1. All ions are polar by definition. However, they do not have a dipole moment that is easily drawn.
2. If the molecule is symmetric, that is, if the molecule is either linear, trigonal planar or tetrahedral, and all the
atoms that connect to the central atom are the same, then the molecule is non-polar. There is no dipole moment to
draw.
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