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The lone pair electron is more spread out and occupies a larger volume, which causes a higher repulsion between two lone pairs. Bonding pairs are pulled in more tightly and occupy less space, which is why lone- bonding pairs have a lower repulsion strength.
This is why when doing VSEPR if there is a linear molecule (2 bonds) and you add a lone pair it becomes bent. The repulsion from the lone pair is so strong that the bonds move closer towards each other to be away from the lone pair.
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