(Polar molecules, Non-polar molecules, etc.)
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In instances where you have structures with VSEPR formulas of AX2E3 or AX2E4, the molecular shape will be linear.; there are 2 bonded atoms and lone pairs present. However, the lone pair electrons are arranged in such a way that their repulsions cancel out to make the shape linear.
When the shape is linear, sometimes the repulsion of the lone pairs will cancel out and therefore not influence the direction of the atoms. In this case, we do not know if there are lone pairs or not because they could be there but just canceled out.