Ch. 8-3 I Bonding Theories Covalent Bonding.

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Presentation transcript:

Ch. 8-3 I Bonding Theories Covalent Bonding

VSEPR Theory Used to explain 3D shape of molecules Valence-shell electron-pair repulsion theory Used to explain 3D shape of molecules

VSEPR Theory Repulsion between electron pairs causes molecular shapes to adjust so that the valence-electron pairs stay as far apart as possible

VSEPR Theory C H

VSEPR Theory

VSEPR Theory Unshared pairs must be accounted for while predicting shapes Alter remaining bond angles as they are pulled closer to the nucleus (due to only one nucleus “pulling” on them, instead of two as in a bond)

VSEPR Theory Unshared pairs must be accounted for while predicting shapes

VSEPR Theory Unshared pairs must be accounted for while predicting shapes Each additional unshared pair causes increased change

VSEPR Theory Unshared pairs must be accounted for while predicting shapes

VSEPR Theory 3D shape is dependent on number of electron domains (groups) Domain – Use the AXE method (each atom will have it’s own value) A – Atom of interest (Central Atom) X – Bonding groups E – Unshared pairs Location of a lone pair or bond around an atom (is independent of whether it is a single, double, or triple bond) Sum equals number of domains

VSEPR Theory 3D shape is dependent on number of electron domains (groups) Each previous example has 4 domains CO2 has only 2 domains

VSEPR Theory p.233 in textbook