(Polar molecules, Non-polar molecules, etc.)
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When there are four regions of electron density, the regions are tetrahedrally arranged. Just think about the model Dr. Lavelle used in class, when replacing a bonded atom with a lone pair, we are basically "taking off a yellow ball". There are no two balls that are arranged exactly opposite to each other in a tetrahedral model; therefore, no matter which two balls you take off, you will always get a shape that is bent instead of having two lone pairs opposite to each other.
When there are 4 regions of electron density, the molecule takes up a tetrahedral shape. The 2 lone pairs take up any 2 “spaces” in the shape. That leads to the molecule itself being a literal observed bent shape.
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