Reactive a. : Having power to react; tending to reaction; of the nature of reaction.

Example:
The two most Reactive families of elements are the halogens and the alkali metals. How do they differ in their

Taxonomy
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Defination from the web:
reactive often refers to a treatment approach where a does not initiate contact as opposed to proactive treatment where ... Retrieved from "http://en.wikipedia.org/wiki/Reactive" Categories: Disambiguation pages. Hidden categories: All disambiguation pages ...