A polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms due to differences in electronegativity.
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Dipole: A pair of equal and oppositely charged poles separated by a distance.
Hydrogen Bond: A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative atom in the other.
Electronegativity: The measure of the ability of an atom to attract electrons (or electron density) towards itself.