Question

Shape of Molecules (Electron Valence Shell Repulsion Model) 1. Count the number of electron pairs (including both bonding and nonbonding pairs) around central atom 2. Determine the geometry based on the number of electron regions 3. Draw the 3-D structure (use stick for bonding electrons, and double dots for nonbonding electrons) 4. Use the number of bonding pairs to determine the shape of molecule. Number of electron pairs Electron pair geometries: 0 lone pair 1 lone pair 2 lone pairs 2 180° X---E---X Linear X 120° E 3 X X X X <120° Trigonal planar Bent X 109° X...E 4 X X X X Tetrahedral E X <109° X <<109° Trigonal pyramid Bent

          Shape of Molecules (Electron Valence Shell Repulsion Model)
1. Count the number of electron pairs (including both bonding and nonbonding pairs) around central atom
2. Determine the geometry based on the number of electron regions
3. Draw the 3-D structure (use stick for bonding electrons, and double dots for nonbonding electrons)
4. Use the number of bonding pairs to determine the shape of molecule.
Number of
electron
pairs
Electron pair
geometries:
0 lone pair
1 lone pair
2 lone pairs
2
180°
X---E---X
Linear
X
120°
E
3
X
X
X
X
<120°
Trigonal planar
Bent
X
109°
X...E
4
X
X
X
X
Tetrahedral
E
X <109°
X
<<109°
Trigonal pyramid
Bent

Shape of Molecules (Electron Valence Shell Repulsion Model)
1. Count the number of electron pairs (including both bonding and nonbonding pairs) around central atom
2. Determine the geometry based on the number of electron regions
3. Draw the 3-D structure (use stick for bonding electrons, and double dots for nonbonding electrons)
4. Use the number of bonding pairs to determine the shape of molecule.
Number of
electron
pairs
Electron pair
geometries:
0 lone pair
1 lone pair
2 lone pairs
2
180°
X—E—X
Linear
X
120°
E
3
X
X
X
X
<120°
Trigonal planar
Bent
X
109°
X...E
4
X
X
X
X
Tetrahedral
E
X <109°
X
<<109°
Trigonal pyramid
Bent

Added by Jennifer L.

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