NAME:__________________________________________ PERIOD:_____
DATE:_________________________
CHEMISTRY - MOLECULAR GEOMETRY ACTIVITY - KEY
1. TWO
BONDED
PAIRS
Bond Angle:
180
Geometry:
linear
1
UNSHARED
PAIR OF
ELECTRONS
Type: MX2
2. THREE
BONDED
PAIRS
3. FOUR
BONDED
PAIRS
4. FIVE
BONDED
PAIRS
5. SIX
BONDED
PARIS
4.
5.
6.
TYPE of Structure
Description:
M=Central Atom
X=Substituent Atom
E=Lone Pair Electrons
Bond Angle:
120
Geometry:
trigonal
planar
Type: MX3
Bond Angle:
<120
Geometry:
bent
Bond Angle:
109.5
Geometry:
tetrahedral
Bond Angle:
107
Geometry:
trigonal
pyramidal
Type: MX3E
Bond Angle:
90/120/180
Geometry:
see saw
Bond Angle:
104.5
Geometry:
bent
Type: MX2E2
Bond Angle:
90/180
Geometry:
T-shaped
Bond Angle:
180
Geometry:
linear
Type: MX4E
Type: MX3E2
Type:MX2E3
Bond Angle:
90/180
Geometry:
square
pyramidal
Type: MX5 E
Bond Angle:
90/180
Geometry:
square
planar
Type: MX4 E2
Bond Angle:
90/180
Geometry:
Type: MX4
Bond Angle:
90/120
Geometry:
trigonal
bipyramidal
Type: MX5
Bond Angle:
90
Geometry:
octahedral
Type: MX6
1.
2.
3.
ANGLES
180
2
UNSHARED
PAIR OF
ELECTRONS
90
120
Type: MX2E
3
UNSHARED
PAIR OF
ELECTRONS
4
UNSHARED
PAIR OF
ELECTRONS
T-shaped
Bond Angle:
180
Geometry:
linear
Type:MX3E3
Type:MX2E4
Draw a diagram of each of the geometries possible in the box provided.
List the Bond Angles and Geometries and Type of Structure
How many atoms are bonded to the central atom in a molecule that has:
a. a linear shape ___ b. a trigonal planar shape ___ c. a tetrahedral shape ___ d. a trigonal bipyramidal shape ___ e. an octahedral shape ___ ?
What other geometries are possible due to lone pairs ____________________________________________________________________________ ?
What is the maximum bond angle for any geometry?_______ What is the minimum bond angle for any geometry? _______
What influences restrict the maximum and minimum bond angles?___________________________________________________________________
Under what conditions is it possible to have the same geometry but different number of electrons?__________________________________________
Give two examples:_________________________________________________________________________________________________________
Judie Flint Baumwirt, 1995 Revised 1998. Adapted from Brady, James, E., General Chemistry Principles and Structure, 5th Ed. John Wiley & Sons, NY, 1990 pp. 262-273.