An element's  reactivity is its tendency to lose or gain electrons. Fluorine (F) is the most reactive metal. Group 1 metals are the most reactive metals as they have only one electron in their outer shell which is easy to lose. The two most reactive groups of elements are the alkali metals and the halogens because of their valence electrons.

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It is fluorine, Fluorine is the most reactivate element non- radio active element in the period table - a stream of fluorine gas spontaneously ignite a concrete block at room temperature, it is the most electronegative element in the periodic table, making it the strongest oxidizing agent. The most chemically reactivate metal is francium. Francium is radioactive, with no stable isotopes while Caesium is themost reactive metal in the periodic table.

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