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|Noun||1.||chemical phenomenon - any natural phenomenon involving chemistry (as changes to atoms or molecules)|
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
natural phenomenon - all phenomena that are not artificial
exchange - chemical process in which one atom or ion or group changes places with another
valency - the phenomenon of forming chemical bonds
pleomorphism, polymorphism - (chemistry) the existence of different kinds of crystal of the same chemical compound