The greater the difference in electronegativity between two bonded atoms, the more polar the bond.

Question

Quizplus · Accepted Answer

This is because electronegativity is a measure of an atom's ability to attract electrons in a covalent bond. When two atoms with significantly different electronegativities bond, the electrons will be closer to the atom with the higher electronegativity, creating a partial negative charge on that atom and a partial positive charge on the other atom. This results in a polar bond.

The Greater the Difference in Electronegativity Between Two Bonded Atoms