Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. Examples of such elements are oxygen and chlorine.

What causes molecules to form?

Molecules are composed of atoms that have bonded and released the extra energy with them as bond formation energy. This bond can either be ionic or covalent. It is formed when nitrogen of NH3 donates its lone pair of electrons into empty orbital of boron in BF3 .

Where molecules are formed?

biomolecule, also called biological molecule, any of numerous substances that are produced by cells and living organisms. Biomolecules have a wide range of sizes and structures and perform a vast array of functions. The four major types of biomolecules are carbohydrates, lipids, nucleic acids, and proteins.