How is a chemical formula structured?

A chemical formula is designed to convey specific information about a substance, primarily focusing on the types and quantities of atoms that make up a compound. In this context, the correct answer highlights the structure of the formula by demonstrating the number of different types of atoms joined together within the compound.

For instance, in the chemical formula H₂O, the subscript '2' indicates that there are two hydrogen atoms for every one oxygen atom in water. This representation provides essential insights into the composition of the compound and allows for understanding how various elements combine to form new substances.

Understanding this aspect is crucial in chemistry, as it forms the basis for predicting the behavior of compounds, their reactivity, and how they can be utilized in various applications. Thus, the structure of a chemical formula is fundamentally about the atomic makeup of the compound rather than charges, mixtures, or physical properties.