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Shapes of Molecules Without building models, predict the shape of the following molecules by first calculating the number of valence electrons, writing the Lewis structure, and then using VSEPR to predict the shape of the molecule. Draw a structural formula to represent each one. 1. Beryllium difluoride BeF2 (First locate Be on the periodic table and note its number of valence electrons. It does not obey the octet rule in bonding.) 2. Phosphorous trichloride PC1 (First locate P on the periodic table and note its number of valence electrons.) 3. Aluminum trichloride AlCl3 (Again, use the periodic table.)
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