(Polar molecules, Non-polar molecules, etc.)
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I'm not sure I understand what you are asking. The VSPER shape of an electron can be tetrahedral when there is a central atom with four things bonded to it. The angles in a tetrahedral are 109.5 degrees because the four atoms bonded to the central atom want to be as far from each other due to repulsion.
The bonds want to create the max amount of distance between them. With only two or three bonds, the bonds can be exist in a plane. With 4, the bonds have the angle of 109.5 degrees. VSEPR states that the lone pairs / bonds will repel each other, and hence the tetrahedral structure makes sense since 109.5 > 90.
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