Compare with covalent bond and ionic bond . A bond involving electrons that are unequally shared. Polar bonds can be thought of as intermediate between the extremes represented by covalent bonds and ionic bonds . Compare with covalent compound , ionic compound and polar bond . An asymmetric molecule containing polar bonds .
Alkanes are usually asymmetric but are nonpolar because they contain no polar bonds.
Polar molecules are electric dipoles and they attract each other via dipole-dipole forces . A property associated with molecules when the center of positive charge and the center of negative charge don't coincide. See also polar molecule and polar bond . Compare with molecule , ion and polyatomic molecule . A polyatomic ion is a charged particle that contains more than two covalently bound atoms.