September 27, 2013
Molecular Shapes
Different molecules form different shapes.Shape is based on electron arrangement.
By drawing Lewis structures, you can determine the shape of moleculesEx. draw the Lewis structure for water.
Water is surrounded by 4 pairs of electrons.2 pairs are involved in bonding, 2 pairs are not.If involved with bonding pairs are called: BONDING PAIRSIf not involved in bonding pairs are called: LONE PAIRS
Electron pairs are arranged so that they are as far away from each other as possible (like charges repel)
So in water: 109.5
107.5 105.5
120
118
180
VSEPR THEORY
September 27, 2013Ex. 2 Carbon Dioxide
Ex. 3 Methane
Ex. 4 Ammonia
