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Molecular Shapes.

Published byCaitlin Shepherd Modified over 6 years ago

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

1 Molecular Shapes

2 VSEPR Theory Valence Shell Electron Pair Repulsion Theory
VSEPR Theory is one method that chemists use to predict the shapes of molecules. This theory predicts that electron pairs, whether involved in bonds or as non-bonding pairs, will adopt a geometry in which they maximize the distance from one another in order to minimize repulsions.

3 Regions of “Electron Density”
Electron Density = Bonding Area or Paired Electron Site. Li Be B C N O F Ne 1 2 3 4 4 4 4 4 Bonding area can be a single, double or triple bond

4 One Region of “Electron Density”
Electron Density = Bonding Area or Paired Electron Site. Bonding area can be a single, double or triple bond Any time there are just two atoms creating a molecule, the geometry is LINEAR

5 Two Regions of “Electron Density”
Electron Density = Bonding Area or Paired Electron Site. Bonding area can be a single, double or triple bond The maximum distance two regions of electron density can get away from affords a geometry called linear.

6 Two Regions of “Electron density”
Bonding Sites Atoms

7 Linear Example O C

8 Linear Example O C CO2

9 Linear Examples O2 O O S Si S SiS2

10 Three Regions of Electron Density
The maximum distance three regions of electron density can get away from affords a geometry called trigonal planar.

11 Three Regions of Electron Density

12 Trigonal Planar F BF3 B F F

13 Four Regions of Electron Density
The maximum distance four regions of electron density can get away from affords a geometry called tetrahedral. Three possible shapes Tetrahedral Pyramidal Bent

14 Four Regions of Electron Density
Non-bonding electron pairs

15 Tetrahedral H CH4 C H H H

16 Pyramidal NH3 N H H H

17 Bent H2O O H H

18 One More Time…

19 Linear Type Bond Angle Example Lewis Structure AX2: Linear 180o BeH2              

20 Trigonal Planar AX3: Trigonal Planar 120o AlH3 Type Bond Angle Example
Lewis Structure AX3: Trigonal Planar 120o AlH3              

21 Tetrahedral AX4: Tetrahedral 109.5o CH4 Type Bond Angle Example
Lewis Structure AX4: Tetrahedral 109.5o CH4             

22 Pyramidal AX3E: Pyramidal 109.5o NH3 Type Bond Angle Example
Lewis Structure AX3E: Pyramidal 109.5o NH3             

23 Bent Type Bond Angle Example Lewis Structure 109.5o H2O              AX2E2: Bent             

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