Unit 2 Topic 7b: VSEPR Theory & Molecular Geometry

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15 Terms

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VSEPR Theory

The Valence Shell Electron Pair Repulsion Theory helps us explain why molecules take the shapes they do

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Tetrahedral

  • 4 sigma bonds

  • 0 unshared pairs

  • bond angle 109.5

<ul><li><p>4 sigma bonds</p></li><li><p>0 unshared pairs</p></li><li><p>bond angle 109.5</p></li></ul><p></p>
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Trigonal pyramidal

  • 3 sigma bonds

  • 1 unshared pair

  • Bond angle 107

<ul><li><p>3 sigma bonds</p></li><li><p>1 unshared pair</p></li><li><p>Bond angle 107</p></li></ul><p></p>
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Bent

  • 2 sigma bonds

  • 2 unshared pairs

  • bond angle 105

<ul><li><p>2 sigma bonds</p></li><li><p>2 unshared pairs</p></li><li><p>bond angle 105</p></li></ul><p></p>
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Trigonal Planar

  • 3 sigma bonds

  • 0 unshared pairs

  • bond angle 120

<ul><li><p>3 sigma bonds</p></li><li><p>0 unshared pairs</p></li><li><p>bond angle 120</p></li></ul><p></p>
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Angular

  • 2 sigma bonds

  • 1 unshared

  • bond angle 117

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<p>Linear </p>

Linear

  • 2 sigma bonds

  • 0 unshared pair

  • bond angle 180

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Octahedral

  • 6 sigma bonds

  • 0 unshared bonds

  • bond angle 90

<ul><li><p>6 sigma bonds</p></li><li><p>0 unshared bonds</p></li><li><p>bond angle 90</p></li></ul><p></p>
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Square pyramidal

  • 5 sigma bonds 

  • 1 unshared bonds

  • bond angle 90

<ul><li><p>5 sigma bonds&nbsp;</p></li><li><p>1 unshared bonds</p></li><li><p>bond angle 90</p></li></ul><p></p>
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Square Planar

  • 4 sigma bonds

  • 2 unshared bonds

  • bond angle 90

<ul><li><p>4 sigma bonds</p></li><li><p>2 unshared bonds</p></li><li><p>bond angle 90 </p></li></ul><p></p>
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T-Shaped

  • 3 sigma bonds

  • 3 unshared bonds

  • bond angle 90 and 180

<ul><li><p>3 sigma bonds</p></li><li><p>3 unshared bonds</p></li><li><p>bond angle 90 and 180</p></li></ul><p></p>
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Trigonal Bipyramidal 

  • 5 sigma bonds

  • 0 unshared bonds

  • bond angles 90 and 120

<ul><li><p>5 sigma bonds</p></li><li><p>0 unshared bonds</p></li><li><p>bond angles 90 and 120</p></li></ul><p></p>
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Seesaw

  • 4 sigma bonds

  • 1 unshared bonds

  • bond angles 87 and 117

<ul><li><p>4 sigma bonds</p></li><li><p>1 unshared bonds</p></li><li><p>bond angles 87 and 117</p></li></ul><p></p>
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Trigonal planar

  • 3 sigma bonds

  • 2 unshared bonds

  • bond angle 120

<ul><li><p>3 sigma bonds</p></li><li><p>2 unshared bonds </p></li><li><p>bond angle 120</p></li></ul><p></p>
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SNAP

Symmetrical Nonpolar- Balanced, bond dipoles cancel each other out

Asymmetrical Polar - has lone pairs on central atom, different electronegativity between bonds (lopsidedness)