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Best Answer: The chemical formula, also known as the empirical formula or the simplest formula is the simplest whole number ratio of the atoms or ions that can combine in a compound. This formula is just like the simplest foundation (also like a blueprint) of how the atomic structure or its formula will be like.
A formula tells what elements make up a molecule. For example, a molecule of water is made up of two hydrogen atoms and one oxygen atom. The formula for a molecule of water is H2O. Molecules come in different sizes and molecular weights.