A hydrogen bond is: a. a strong attraction between hydrogen and another atom. b. a bond between a hydrogen atom already covalently bound to one atom and made partially negative by unequal electron sharing with another atom. c. a bond between a hydrogen atom already covalently bound to one atom and made partially positive by unequal electron sharing with another atom. d. weaker than van der Waals forces. e. exemplified by the two hydrogens covalently bound to oxygen in the water molecule.