(Polar molecules, Non-polar molecules, etc.)
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The lone pairs and bonded atoms are regions of electron density. These regions will cause repulsion with other regions, which affects the molecule geometries and bond angles, as these regions will want to be as far as possible from other regions in order to be the most stable.
Bonding pairs of atoms and lone pairs repel each other so that they are roughly equally spaced from each other. Based on the number of bonding pairs/lone pairs, the atom forms a unique 3D shape. There are some additional factors, including that lone pairs have higher repulsion than bonding pairs, that bonded atoms that have more electrons have slightly higher repulsion against lone pairs, etc. but basically the VSEPR shape that forms in a molecule equalizes the repulsion felt by each bonded atom.
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