Molecular Structure Molecular Geometry I II III A

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Molecular Structure Molecular Geometry I II III

Molecular Structure Molecular Geometry I II III

A. VSEPR Theory n Valence Shell Electron Pair Repulsion Theory n Electron pairs orient

A. VSEPR Theory n Valence Shell Electron Pair Repulsion Theory n Electron pairs orient themselves in order to minimize repulsive forces.

A. VSEPR Theory n Types of e- Pairs · Bonding pairs - form bonds

A. VSEPR Theory n Types of e- Pairs · Bonding pairs - form bonds · Lone pairs - nonbonding e- Lone pairs repel more strongly than bonding pairs!!!

A. VSEPR Theory n Lone pairs reduce the bond angle between atoms. Bond Angle

A. VSEPR Theory n Lone pairs reduce the bond angle between atoms. Bond Angle

B. Determining Molecular Shape n Draw the Lewis Diagram. n Tally up e- pairs

B. Determining Molecular Shape n Draw the Lewis Diagram. n Tally up e- pairs on central atom. · double/triple bonds = ONE pair n Shape is determined by the # of bonding pairs and lone pairs. Know the 8 common shapes & their bond angles!

C. Common Molecular Shapes 4 Total 2 Bond 0 Lone CO 2 LINEAR 180°

C. Common Molecular Shapes 4 Total 2 Bond 0 Lone CO 2 LINEAR 180°

C. Common Molecular Shapes 3 Total 3 Bond 0 Lone BF 3 TRIGONAL PLANAR

C. Common Molecular Shapes 3 Total 3 Bond 0 Lone BF 3 TRIGONAL PLANAR 120°

C. Common Molecular Shapes 3 Total 2 Bond 1 Lone SO 2 BENT <120°

C. Common Molecular Shapes 3 Total 2 Bond 1 Lone SO 2 BENT <120°

C. Common Molecular Shapes 4 Total 4 Bond 0 Lone CH 4 TETRAHEDRAL 109.

C. Common Molecular Shapes 4 Total 4 Bond 0 Lone CH 4 TETRAHEDRAL 109. 5°

C. Common Molecular Shapes 4 Total 3 Bond 1 Lone NH 3 TRIGONAL PYRAMIDAL

C. Common Molecular Shapes 4 Total 3 Bond 1 Lone NH 3 TRIGONAL PYRAMIDAL 107° C. Johannesson

C. Common Molecular Shapes 4 Total 2 Bond 2 Lone H 2 O BENT

C. Common Molecular Shapes 4 Total 2 Bond 2 Lone H 2 O BENT 104. 5° C. Johannesson

C. Common Molecular Shapes 5 Total 5 Bond 0 Lone PCl 5 TRIGONAL BIPYRAMIDAL

C. Common Molecular Shapes 5 Total 5 Bond 0 Lone PCl 5 TRIGONAL BIPYRAMIDAL 120°/90°

C. Common Molecular Shapes 6 Total 6 Bond 0 Lone SF 6 OCTAHEDRAL 90°

C. Common Molecular Shapes 6 Total 6 Bond 0 Lone SF 6 OCTAHEDRAL 90°

D. Examples n PF 3 4 Total 3 Bond 1 Lone F P F

D. Examples n PF 3 4 Total 3 Bond 1 Lone F P F F TRIGONAL PYRAMIDAL 107°

D. Examples n HCN 2 Total 2 Bond 0 Lone H C N LINEAR

D. Examples n HCN 2 Total 2 Bond 0 Lone H C N LINEAR 180° C. Johannesson

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