Elements are the smallest substances that exist.They react each other to form molecules and compounds.
The reactivity of elements is determined by their dissociation energy and electron affinity.
Among the elements, halogens are the most reactive elements due to their low dissociation energy and high electron affinity value.Florine is the most reactive element due to weak bond between florine atoms because of strong repulsion between the non-bonding electrons.Florine, chlorine, bromine, iodine, hydrogen, oxygen and nitrogen are called halogen group.
You can learn the reactivity of elements from Reactivity series which is a summarized information about the reactivity of all element.It is by these reactivities that chemical reactions take place.
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