ratio . This means that each compound can be represented by a chemical formula. For example, the formula ... of water is H₂O and the formula of carbon dioxide is CO₂.

The chemical formula of a covalent molecular substance gives the number of atoms per molecule. The formula of a covalent network or ionic compound gives the simplest ratio of atoms/ions in the ...

Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds.