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If you draw out the Lewis structure of AsBr3, you'll realize that it has one lone electron pair on top of the central atom (As), which contains a greater electronegativity than any bonding pairs. Because of the electronegativity of the lone pairs, the bonding pairs are pushed hardly together, making the molecule asymmetrical or POLAR.

When none of the net dipole moments of all individual bonds cancel out; the molecule turns out being POLAR. If all of them are canceled out, then you have a NON-POLAR molecule.

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12y ago

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