Molecular Shapes

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12 Terms

1
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Linear

  • AB or AB2

  • 180 degrees

  • Electron domain geometry: linear

  • 5 fundamental domain arrangements

<ul><li><p>AB or AB<sub>2</sub></p></li><li><p>180 degrees</p></li><li><p>Electron domain geometry: linear</p></li><li><p>5 fundamental domain arrangements</p></li></ul>
2
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Trigonal Planar

  • AB3

  • 120 degrees

  • Electron domain geometry: trigonal planar

  • 5 fundamental domain arrangements

<ul><li><p>AB<sub>3</sub></p></li><li><p>120 degrees</p></li><li><p>Electron domain geometry: trigonal planar</p></li><li><p>5 fundamental domain arrangements</p></li></ul>
3
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Tetrahedral

  • AB4

  • 109.5 degrees

  • Electron domain geometry: tetrahedral

  • 5 fundamental domain arrangements

<ul><li><p>AB<sub>4</sub></p></li><li><p>109.5 degrees</p></li><li><p>Electron domain geometry: tetrahedral</p></li><li><p>5 fundamental domain arrangements</p></li></ul>
4
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Trigonal Bipyramidal

  • AB5

  • 90 degrees (axial-equitorial)

  • 180 degrees (axial-axial)

  • 120 degrees (equitorial-equitorial)

  • Electron domain geometry: trigonal bipyramidal

  • 5 fundamental domain arrangements

<ul><li><p>AB<sub>5</sub></p></li><li><p>90 degrees (axial-equitorial)</p></li><li><p>180 degrees (axial-axial)</p></li><li><p>120 degrees (equitorial-equitorial)</p></li><li><p>Electron domain geometry: trigonal bipyramidal</p></li><li><p>5 fundamental domain arrangements</p></li></ul>
5
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Octahedral

  • AB6

  • 90 degrees (axial-equitorial)

  • 90 degrees (equitorial-equitorial)

  • 180 degrees (axial-axial)

  • Electron domain geometry: octahedral

  • 5 fundamental domain arrangements

<ul><li><p>AB<sub>6</sub></p></li><li><p>90 degrees (axial-equitorial)</p></li><li><p>90 degrees (equitorial-equitorial)</p></li><li><p>180 degrees (axial-axial)</p></li><li><p>Electron domain geometry: octahedral</p></li><li><p>5 fundamental domain arrangements</p></li></ul>
6
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Bent

  • AB2E or AB2E2

  • 3 or 4 electron domains

  • 1 or 2 lone pairs

  • Electron domain geometry: tetrahedral (2 lone pairs) or trigonal planar (1 lone pairs)

<ul><li><p>AB<sub>2</sub>E or AB<sub>2</sub>E<sub>2</sub></p></li><li><p>3 or 4 electron domains</p></li><li><p>1 or 2 lone pairs</p></li><li><p></p></li><li><p>Electron domain geometry: tetrahedral (2 lone pairs) or trigonal planar (1 lone pairs)</p></li></ul>
7
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Trigonal Pyramidal

  • AB3E

  • 4 electron domains

  • 1 lone pair

  • <109.5 degrees

  • Electron domain geometry: tetrahedral

<ul><li><p>AB<sub>3</sub>E</p></li><li><p>4 electron domains</p></li><li><p>1 lone pair</p></li><li><p>&lt;109.5 degrees</p></li><li><p>Electron domain geometry: tetrahedral</p></li></ul>
8
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See Saw

  • AB4E

  • 5 electron domains

  • 1 lone pair

  • 90 degrees (axial-equitorial)

  • 180 degrees (axial-axial)

  • <120 degrees (equitorial-equitorial)

  • Electron domain geometry:

<ul><li><p>AB<sub>4</sub>E</p></li><li><p>5 electron domains</p></li><li><p>1 lone pair</p></li><li><p>90 degrees (axial-equitorial)</p></li><li><p>180 degrees (axial-axial)</p></li><li><p>&lt;120 degrees (equitorial-equitorial)</p></li><li><p>Electron domain geometry: </p></li></ul>
9
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T-shaped

  • AB3E2

  • 5 electron domains

  • 2 lone pairs

  • 90 degrees (axial-equatorial)

  • Electron domain geometry:

<ul><li><p>AB<sub>3</sub>E<sub>2</sub></p></li><li><p>5 electron domains</p></li><li><p>2 lone pairs</p></li><li><p>90 degrees (axial-equatorial)</p></li><li><p>Electron domain geometry:</p></li></ul>
10
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Linear

  • AB2E3

  • 5 electron domains

  • 3 lone pairs

  • 180 degrees (equatorial-equatorial)

  • Electron domain geometry:

<ul><li><p>AB<sub>2</sub>E<sub>3</sub></p></li><li><p>5 electron domains</p></li><li><p>3 lone pairs</p></li><li><p>180 degrees (equatorial-equatorial)</p></li><li><p>Electron domain geometry: </p></li></ul>
11
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Square Pyramidal

  • AB5E1

  • 6 electron domains

  • <90 degrees

<ul><li><p>AB<sub>5</sub>E<sub>1</sub></p></li><li><p>6 electron domains</p></li><li><p>&lt;90 degrees</p></li></ul>
12
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Square Planar

  • AB4E2

  • 6 electron domains

  • 90 degree bond angles

<ul><li><p>AB<sub>4</sub>E<sub>2</sub></p></li><li><p>6 electron domains</p></li><li><p>90 degree bond angles</p></li></ul>