The tendency of a substance to undergo chemical reaction with other substances. In psychology, refers to the degree of response to stimuli.
From Latin 're-' (back, again) + 'activus' (active) + '-ity' (quality of). The term evolved from general responsiveness to specific chemical and psychological contexts in the 19th-20th centuries.
Reactivity is crucial in chemistry because it determines everything from how metals corrode to how medicines work in our bodies. Paradoxically, some of the most reactive elements like sodium are also the most useful when properly controlled and combined.
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