To build or draw a model of PCl3, we must first know the number of atoms of each element in the compound. The compound has four atoms, three of one kind and one of a different kind.
A molecular model is an avid description of a molecule. It helps us to have an idea of how the molecule looks.
If I want to make a molecular model of PCl3, I need about four balls. Three of one color and one of another color.
The different colors represent the two different elements in PCl3. The lone ball of one color stands for phosphorus while the three balls of the same color stands for chlorine atoms.
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