The strongest chemical bond is the covalent bond. In such a bond, a chemical link forms between two atoms with shared electrons. A common example of a covalent bond is water, in which both the hydrogen atoms and the oxygen atom share electrons.
Many organic compounds, such as carbohydrates, result from covalent bonding. Compounds formed from covalent bonding share similar characteristics. For example, most have melting and boiling points that are comparatively low, and the compounds are also usually flexible. Another type of strong bond, though not as strong as a covalent bond, is the ionic bond. In an ionic bond, ions with opposite charges hold the atoms together. A common example of an ionic bond is table salt.