There are many types of chemical bond found within the world of biochemistry. Bonds are the forces that hold together atoms or molecules together in a compound or solution.
Hydogen bonds are formed when the atoms hydrogen, nitrogen, fluorine or oxygen are present between moleules. These bonds are relatively high in strength but are very weak in comparison to covalent bonding. Hydrogen bonds can be found between water molecules, or between ater molecules and other molecules capable of hydrogen bonding. This allows a solution to form.
Covalent bonds are formed by a shared pair of electrons.This occurs when two atoms come together, and due to an incmplete figuration of electrons on each atom, electrons are then shared between the atoms and an extremely strong bond then forms between the atoms, usually to then form a molecule.
Ionic bonds are formed by the electrostatic attraction between ions, which carry an opposite charge. These are also very strong bonds, which gives some ionic compounds their high melting point such as NaCl. However, these bonds are interrupted in solution, and an ionic compound will then dissolve in water.
Metallic bonds are formed by the attraction between metal ions which tend to be positive, and the negatively charged delocalised electrons. This strong bonding is why metals have a high melting point.