Final answer:
Hydrogen ions are unhappy because they have lost their electron and in order to become fulfilled, they bond with other atoms or molecules to gain stability. This is achieved through the formation of covalent bonds, such as in water molecules.
Step-by-step explanation:
The hydrogen ion, H+, is unhappy because it has lost its one and only electron, leaving it with a positive charge and an incomplete energy level. In order to become fulfilled, hydrogen ions bond with other atoms or molecules to gain stability. In the case of water molecules, hydrogen ions bond with oxygen atoms by sharing electrons to form covalent bonds. By sharing electrons, the hydrogen atom gains the necessary electrons to complete its outer energy level, while the oxygen atom gains electrons to fill its outer energy level. This arrangement results in both the hydrogen and oxygen atoms becoming fulfilled and the formation of a stable water molecule.