(Polar molecules, Non-polar molecules, etc.)
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Due to the shape of the electron density, lone pairs have greater repulsion force than bonding pairs of electrons. The shape of the orbitals that hold lone pairs is shorter and rounder, much like a balloon, whereas bonding pairs are more elongated, thus they have less repulsion force.
Lone pair electrons are further from the positively-charged nucleus of an atom compared to bonding pairs of electrons and are therefore bound with less electrostatic force, causing them to have stronger repulsive forces than bonding pairs of electrons. Lone pairs have a larger range of negativity compared to bonding pairs, resulting in stronger repulsive forces between other atoms.
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