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Warm-Up: to be turned in Write the electron configuration, noble-gas configuration and orbital notation for: Sulfur and Calcium.

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Presentation on theme: "Warm-Up: to be turned in Write the electron configuration, noble-gas configuration and orbital notation for: Sulfur and Calcium."— Presentation transcript:

1 Warm-Up: to be turned in Write the electron configuration, noble-gas configuration and orbital notation for: Sulfur and Calcium

2 VSPER Theory & Molecular Geometry

3 VSEPR Theory stands for “valence-shell, electron-pair repulsion” When bonding occurs, the electrons pairs will orient themselves so they are spread out as far as possible – Refers to valence electrons of central atom in the molecule

4 VSEPR Molecular Geometry Lewis Dot Structures can be used to predict molecular shape Actual shape of the molecule is determined by the atoms only – Unpaired electrons on the central atom do take up space, however, and do affect the shape – Total number of electron concentrations= Shared pairs + lone pairs Double and triple bonds are treated the same as single bonds, and have no affect on the molecular shape

5 Linear General formula: AB 2 2 atoms bonded to central atom Ex: CO 2 180° O C O

6 Trigonal Planar General formula: AB 3 3 atoms bonded to central atom Ex: BF 3 120° F B F

7 Bent 2 shared 0 lone Total: 3

8 Tetrahedral General formula: AB 4 4 atoms bonded to central atom Ex: CH ° H H C H H

9 Trigonal Pyramidal General formula: AB 3 3 atoms bonded to central atom 1 lone pair of electrons on central atom Ex: NH 3 107° H N H H

10 Bent General formula: AB 2 E or AB 2 E 2 2 atoms bonded to central atom 1 or 2 Lone pairs of electrons on central atom Ex: H 2 O 105° O H H

11 Homework: Due 10/26/2012 Draw Lewis Dot Structures for the following molecules. Then predict the molecular shape according to VSEPR theory. SCl 2 PI 3 Cl 2 O NH 2 Cl SiCl 3 Br


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