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VSEPR THEORY Chemistry. Polyatomic Ions  Ions that are composed of covalently bound atoms.  Add or subtract electrons for charge when finding total.

Published byRodger French Modified over 9 years ago

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Presentation on theme: "VSEPR THEORY Chemistry. Polyatomic Ions  Ions that are composed of covalently bound atoms.  Add or subtract electrons for charge when finding total."— Presentation transcript:

1 VSEPR THEORY Chemistry

2 Polyatomic Ions  Ions that are composed of covalently bound atoms.  Add or subtract electrons for charge when finding total NO 3 -1 SO 4 -2 PO 4 -3 OH -1 CN -1 SO 3 -2

3 Copyright © Cengage Learning. All rights reserved 3  More than one valid Lewis structure can be written for a particular molecule. NO 3 – = 24e – Resonance

4 Copyright © Cengage Learning. All rights reserved 4  Actual structure is an average of the resonance structures.  Electrons are really delocalized – they can move around the entire molecule. Resonance

5 VSEPR Theory (Valence Shell Electron Pair Repulsion)  Molecules have a 3D shape  Shape is determined from VSEPR Theory  VSEPR Theory- Valence e - pair repulsions cause atoms to shift as far apart as possible  In other words, atoms and lone pair e - want to stay as far away as possible! Unshared electron pair 107°

6 Copyright © Cengage Learning. All rights reserved 6 Arrangements of Electron Pairs Around an Atom Yielding Minimum Repulsion

7 Copyright © Cengage Learning. All rights reserved 7 Structures of Molecules That Have Four Electron Pairs Around the Central Atom

8 VSEPR Shapes Shape# of Lone Pair e - on the Central Atom # of Atoms Connected to the Central Atom Linear*If only 2 atoms in the entire molecule Linear02 Bent1 or 22 Trigonal Planar03 Pyramidal13 Tetrahedral04

9 What are the shapes of the following molecules? 1. HF 2. H 2 O 3. PI 3 4. TeO 2 5. SO 3 5. CBr 4 6. CH 2 F 2 7. C 2 H 4 8. BH 3 9. SO 3 -2

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