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Lone pairs weaken the strength of a bond because of electron repulsion - the lone pair electrons of an atom will repel the bonded electrons and such electron-electron repulsion will reduce the overall bond's strength.
angelagd3l wrote:Do lone pairs also affect the way the model is oriented? Because of the repulsion?
Yes, they do because lone pairs repel the bonding pairs, which changes the orientation. The best example is how in a linear molecule, if you add a lone-pair, the molecule becomes bent.
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