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Molecular Geometry ( Textbook: page383-392)

Molecular Geometry ( Textbook: page383-392). Valence Electron Pair Repulsion. Molecular Geometry. The arrangement of atoms within a given molecule. VSEPR Theory. Is based on simple electrostatic repulsions of electron pairs Assumption

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Molecular Geometry ( Textbook: page383-392)

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  1. Molecular Geometry( Textbook: page383-392) Valence Electron Pair Repulsion

  2. Molecular Geometry The arrangement of atoms within a given molecule.

  3. VSEPR Theory • Is based on simple electrostatic repulsions of electron pairs • Assumption  Electrons in chemical bonds( single, double, or triple) and unshared electron pairs are negative centers that repel each other

  4. Molecular Geometry • Linear Formula= AX2 • Trigonal Planar Formula = AX3 • V-shaped Formula = : AX2 • Tetrahedral Formula = AX4 • Trigonal Pyramidal Formula = : AX3 • Trigonal Bipyramidal Formula = AX5 . . • T-shaped Formula = : A X3 • See Saw Formula = : AX4 • Octahedral Formula = AX6 Note: A –represents the central atom X – represents the attached atom

  5. ( AX2) Linear 2 Bonding pairs 0 lone pairs

  6. Ex: BeCl2 Cl– Be—Cl 1800 Linear Ex: CO2 O=C=O 1800

  7. Trigonal Planar AX3 3 Bonding Pairs 0 lone pairs

  8. Ex:BCl3 Cl B 120 Cl Cl Trigonal Planar

  9. .. : AX2 V-shaped 2 Bonding pairs 2 lone pairs

  10. Ex: H20 H– O –H since lone pair is more electronegative than the bonding pairs it tends to push the bonding pairs closer together, thereby decreasing the angle between them O H H v-shaped (less than 1090)

  11. Tetrahedral ( AX4) 4 bonding pairs 0 lone pairs

  12. Ex: CH4 H 109 H C H H Ex: SO42- O O S O O

  13. Trigonal Pyramidal :AX3 3 bonding pairs One lone pair

  14. Ex: NH3 109.50 N H HH

  15. Exercises Write the Lewis structure and predict the molecular geometry of the following using VSPER Model • OF2 2) PF3 3) CS2 • NSF • SF4 • SO42- • PH3 8) SO3

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