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Reactivity is a term related to the aggressiveness (or not) of an element to combine with other elements. Oxygen, Chlorine, and Fluorine are among the most aggressive.
The reactivity of halogens decreases down the group, which means Fluorine is the most reactive halogens as it is the most electronegative elements among the halogens, and also the Periodic Table.
The activity (or reactivity) series determines whether or not a metal will replace another one in a replacement reaction.See the Related Questions to the left for more information about the activity series.
fluorine is most electronegative and cesium is least electronegative
Oxygen is more electronegative than selenium.
Fluorine (F) is the most electronegative element in the periodic table. For more info: see related link
Oxygen is more electronegative than hydrogen.
golds reactivity is very low in the reactivity series ....
3.44 Very electronegative.
An electronegative atom gain electrons.
Sulfur is more electronegative than beryllium.
Is the reactivity of an alloy very different from the reactivity of its major component?"