Find the chromatic number of the graph below. 
Definitions:
Nonpolar
Describes molecules that do not have a separation of electric charge, leading to a lack of electric poles and evenly distributed electrical charges.
Lewis Structures
Diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule, illustrating the valence electron arrangements.
Nitric Acid
A highly corrosive and toxic strong acid with the formula HNO3, used in the production of fertilizers, explosives, and in various nitration processes.
Formal Charges
The assignment of a charge to an atom within a molecule based on the assumption that electrons in chemical bonds are evenly distributed amongst atoms.
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