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Molecular Geometry.

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Presentation on theme: "Molecular Geometry."— Presentation transcript:

1 Molecular Geometry

2 Valence Shell Electron Pair Repulsion
(VSEPR) model: Predicts the geometry of a molecule from the electrostatic repulsions between the valence electron (bonding and nonbonding) pairs around a central atom.

3 Key  Bonded electrons Lone pair electrons in the plane of the page
forward backward Lone pair electrons Atom Designation A (center atom) B (bonded atom) E (lone pair) 

4 Arrangement of electron pairs
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry AB2 2 linear linear B trigonal planar trigonal planar AB3 3 AB4 4 tetrahedral tetrahedral

5 Arrangement of electron pairs
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal bipyramidal trigonal bipyramidal AB5 5 AB6 6 octahedral octahedral

6 Summary of Bonding Arrangements
0 lone pairs on central atom Summary of Bonding Arrangements F Be 2 atoms bonded to central atom

7 < bonding-pair vs. bonding- pair repulsion lone-pair vs. lone-pair
lone-pair vs. bonding- <

8 Arrangement of electron pairs
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal planar AB2E 2 1 bent trigonal pyramidal AB3E 3 1 tetrahedral

9 distorted tetrahedron AB4E 4 1
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry AB2E2 2 2 tetrahedral bent trigonal bipyramidal distorted tetrahedron AB4E 4 1

10 Arrangement of electron pairs
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry trigonal bipyramidal AB3E2 3 2 T-shaped trigonal bipyramidal AB2E3 2 3 linear

11 Arrangement of electron pairs
“Bonding regions” “Nonbonding regions” Class # of atoms bonded to central atom # lone pairs on central atom Arrangement of electron pairs Molecular Geometry square pyramidal AB5E 5 1 octahedral square planar AB4E2 4 2 octahedral

12 Predicting Molecular Geometry
Draw the Lewis structure. Identify the number of bonding and nonbonding regions around the central atom. Use VSEPR to identify the geometry of the molecule. (i.e. match class and state shape name) Helpful video:

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