What is the true ratio of atoms in a molecule or formula unit called

The true ratio of atoms in a molecule or formula unit is called the molecular formula. This formula can show exactly how many and what types of atoms there are in a molecule, but it cannot show how they are arranged structurally. For example, the molecular formula for cyclopropane is C3H6.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.