"Chemistry is based in and exhibits a set of distinctive concepts that plays a central role in its practice: substance, reactivity or affinity, periodicity, and shape. The concept of substance has no analogue in physics. As noted, chemistry is the study of transformations, or dispositions to react, of different substances. Substances possess characteristic properties at all supra-molecular scales (e.g., hardness, melting/boiling point, conductivity, etc.) ... Above all, the chemist is interested in the stability/reactivity of the substance, its likelihood to bond with another substance to create a third (affinity) by the transformation of their molecules and/or atoms."

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