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lone pairs on a central atom has exceptional repulsion strength so they try to repel all nearby bonds/electrons which is why some molecules with a lone pair on the central atom that should have a certain bond angle, have slightly different ones; the lone pair pushes the bonded pairs closer to one another. So, a tetrahedral for example, should have a 109.5* bond, but if there is a lone pair on the central atom which counts as one of the regions of electron density, then the bond will be slightly less than 109.5*.
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