side be a covalent bond and the other being an ionic bond ??? ??? ??? hydrogen ion a positively charged atom of hydrogen ??? ??? ??? hydrophilic having a strong affinity for water ??? ??? ??? hydrophobic lacking affinity for water ??? ??? ??? hydroxyl group the monovalent group -OH in such compounds as bases and some acids and alcohols ??? ??? ??? hydroxide ion OH- ??? ??? ??? ion a particle that