Polar bonds are caused by the bonding pair of electrons being attracted more to one atom than the other.

Question

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Polar bonds occur when there is a difference in the electronegativity (or electron-attracting ability) of the two atoms bonded together. The atom with higher electronegativity will attract the bonding pair of electrons more strongly, creating a partial negative charge on that atom and a partial positive charge on the other atom. This unequal sharing of electrons creates a polar bond.

Polar Bonds Are Caused by the Bonding Pair of Electrons