AP Chemistry - Molecular Geometries

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15 Terms

1

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Linear Molecular Geometry

Electron Pair Geometry: linear (2 electron regions)
# Electron Bonding Regions:2
# Lone Pairs: 0
Bond Angle: 180

<ul><li><p>Electron Pair Geometry: linear (2 electron regions)</p></li><li><p># Electron Bonding Regions:2</p></li><li><p># Lone Pairs: 0</p></li><li><p>Bond Angle: 180</p></li></ul><p></p>

2

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Trigonal Planar

Electron Pair Geometry: trigonal planar (3 electron regions)
# Electron Bonding Regions: 3
# Lone Pairs: 0
Bond Angle: 120

<ul><li><p>Electron Pair Geometry: trigonal planar (3 electron regions)</p></li><li><p># Electron Bonding Regions: 3</p></li><li><p># Lone Pairs: 0</p></li><li><p>Bond Angle: 120</p></li></ul><p></p>

3

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Bent (Trigonal Planar Electron Pair Geometry)

Electron Pair Geometry: trigonal planar (3 electron regions)
# Electron Bonding Regions: 2
# Lone Pairs: 1
Bond Angle: <120 (lone pair version of trigonal planar; less than 120 bc lone pair pushes the atoms apart)

<ul><li><p>Electron Pair Geometry: trigonal planar (3 electron regions)</p></li><li><p># Electron Bonding Regions: 2</p></li><li><p># Lone Pairs: 1</p></li><li><p>Bond Angle: <120 (lone pair version of trigonal planar; less than 120 bc lone pair pushes the atoms apart)</p></li></ul><p></p>

4

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Tetrahedral

Electron Pair Geometry: tetrahedral (4 electron regions)
# Electron Bonding Regions: 4
# Lone Pairs: 0
Bond Angle: 109.5

<ul><li><p>Electron Pair Geometry: tetrahedral (4 electron regions)</p></li><li><p># Electron Bonding Regions: 4</p></li><li><p># Lone Pairs: 0</p></li><li><p>Bond Angle: 109.5</p></li></ul><p></p>

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Trigonal Pyramidal

Electron Pair Geometry: tetrahedral (4 electron regions)
# Electron Bonding Regions: 3
# Lone Pairs: 1
Bond Angle: 107 OR <109.5 (it’s bascially tetrahedral but lone pair, so it pushes the lone pairs closer)

<ul><li><p>Electron Pair Geometry: tetrahedral (4 electron regions)</p></li><li><p># Electron Bonding Regions: 3</p></li><li><p># Lone Pairs: 1</p></li><li><p>Bond Angle: 107 OR <109.5 (it’s bascially tetrahedral but lone pair, so it pushes the lone pairs closer)</p></li></ul><p></p>

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Bent (Tetrahedral Electron Pair Geometry)

Electron Pair Geoemtry: Tetrahedral (4 electron regions)
# Electron Bonding Regions: 2
# Lone Pairs: 2
Bond Angle: <109.5 OR 104.5 (it has 2 lone pairs, so it pushes the atoms even closer together than trigonal planar)

<ul><li><p>Electron Pair Geoemtry: Tetrahedral (4 electron regions)</p></li><li><p># Electron Bonding Regions: 2</p></li><li><p># Lone Pairs: 2</p></li><li><p>Bond Angle: <109.5 OR 104.5 (it has 2 lone pairs, so it pushes the atoms even closer together than trigonal planar)</p></li></ul><p></p>

7

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Trigonal Bipyramidal

Electron Pair Geometry: trigonal bipyramidal (5 electron regions)
# Electron Bonding Regions: 5
# Lone Pairs: 0
Bond Angle: 90, 120

<ul><li><p>Electron Pair Geometry: trigonal bipyramidal (5 electron regions)</p></li><li><p># Electron Bonding Regions: 5</p></li><li><p># Lone Pairs: 0</p></li><li><p>Bond Angle: 90, 120 </p></li></ul><p></p>

8

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See-Saw

Electron Pair Geometry: Trigonal Bipyramidal (5 electron regions)
# Electron Bonding Regions: 4
# Lone Pairs: 1
Bond Angle: 180, 120/<120, 90 (remove one from the equator of trigonal bipyramidal)

<ul><li><p>Electron Pair Geometry: Trigonal Bipyramidal (5 electron regions)</p></li><li><p># Electron Bonding Regions: 4</p></li><li><p># Lone Pairs: 1</p></li><li><p>Bond Angle: 180, 120/<120, 90 (remove one from the equator of trigonal bipyramidal)</p></li></ul><p></p>

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T-Shaped

Electron Pair Geometry: trigonal bipyramidal (5 electron regions)
# Electron Bonding Regions: 3
# Lone Pairs: 2
Bond Angle: 180, 90 (remove one from the equator of T-shape)

<ul><li><p>Electron Pair Geometry: trigonal bipyramidal (5 electron regions)</p></li><li><p># Electron Bonding Regions: 3</p></li><li><p># Lone Pairs: 2</p></li><li><p>Bond Angle: 180, 90 (remove one from the equator of T-shape)</p></li></ul><p></p>

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Linear (Electron Pair Geometry: Trigonal Bipyramidal)

Electron Pair Geometry: trigonal bipyramidal (5 electron regions)
# Electron Bonding Regions: 2
# Lone Pairs: 3
Bond Angle: 180

<ul><li><p>Electron Pair Geometry: trigonal bipyramidal (5 electron regions)</p></li><li><p># Electron Bonding Regions: 2</p></li><li><p># Lone Pairs: 3</p></li><li><p>Bond Angle: 180</p></li></ul><p></p>

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Octahedral

Electron Pair Geometry: Octahedral (6 electron regions)
# Electron Bonding Regions: 6
# Lone Pairs: 0
Bond Angle: 90

<ul><li><p>Electron Pair Geometry: Octahedral (6 electron regions)</p></li><li><p># Electron Bonding Regions: 6</p></li><li><p># Lone Pairs: 0</p></li><li><p>Bond Angle: 90</p></li></ul><p></p>

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Square Pyramidal

Electron Pair Geometry: Octahedral (6 electron regions)
# Electron Bonding Regions: 5
# Lone Pairs: 1
Bond Angle: 90, 180 (take off a pole from octahedral)

<ul><li><p>Electron Pair Geometry: Octahedral (6 electron regions)</p></li><li><p># Electron Bonding Regions: 5</p></li><li><p># Lone Pairs: 1</p></li><li><p>Bond Angle: 90, 180 (take off a pole from octahedral)</p></li></ul><p></p>

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Square Planar

Electron Pair Geometry: Octahedral (6 electron regions)
# Electron Bonding Regions: 4
# Lone Pairs: 2
Bond Angle: 90, 180 (remove a pole from square pyramidal)

<ul><li><p>Electron Pair Geometry: Octahedral (6 electron regions)</p></li><li><p># Electron Bonding Regions: 4</p></li><li><p># Lone Pairs: 2</p></li><li><p>Bond Angle: 90, 180 (remove a pole from square pyramidal)</p></li></ul><p></p>

14

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T-Shaped (Electron Pair Geometry: Octahedral

Electron Pair Geometry: Octahedral (6 electron regions)
# Electron Bonding Regions: 3
# Lone Pairs: 3
Bond Angle: 90, 180

<ul><li><p>Electron Pair Geometry: Octahedral (6 electron regions)</p></li><li><p># Electron Bonding Regions: 3</p></li><li><p># Lone Pairs: 3</p></li><li><p>Bond Angle: 90, 180</p></li></ul><p></p>

15

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Linear (Electron Pair Geometry: Octahedral)

Electron Pair Geometry: Octahedral (6 electron regions)
# Electron Bonding Regions: 2
# Lone Pairs: 4
Bond Angle: 180

<ul><li><p>Electron Pair Geometry: Octahedral (6 electron regions)</p></li><li><p># Electron Bonding Regions: 2</p></li><li><p># Lone Pairs: 4</p></li><li><p>Bond Angle: 180</p></li></ul><p></p>