(Polar molecules, Non-polar molecules, etc.)
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We represent molecules using 2D Lewis structures, but they really exist in 3D space. This means that the atoms can get father away from each other, going behind or coming in front of the central atom, which explains the larger bond angle of 109.5
In that instance you would have to consider a 3D model instead of a 2D model. The surrounding atoms want to be as far away from each other as possible so a three dimensional model provides the most space between the atoms.
Tetrahedral shaped atoms have bonds at a 109.5 degree angle because of its 3 dimensional shape! If each bond was 90 degrees away from each other, it would be more similar to having a flat shape but to maximize the space that the atom has (and because of the negatively charged electron's repulsion from each other), the bonds are at a 109.5 degree angle.
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