The atoms in organic compounds are held together by strong covalent bonds.A covalent bond is formed when two atoms share a pair of electrons.Carbon forms four covalent bonds, nitrogen forms three covalent bonds, oxygen forms two covalent bonds and hydrogen forms one.Intermolecular bonds are bonds between molecules and they are weaker than covalent bonds. Hydrogen bonding occurs widely in nature and is the strongest type of intermolecular bond.Ionic bonding occurs between oppositely charged ions and oppositely charged groups on organic molecules such as NH3+ and COO-.