The most reactive groups in the periodic table are the alkali earth metals (group 1) and the halogens (group 17).
The periodic table is composed of 18 groups of elements with varying degrees of reactivity.
However, the first group of elements called the alkali earth metals (group 1) and the second to the last group of elements called the halogens (group 17) are the most reactive all the elements in the periodic table.
Their elements can never occur free in nature, they always occur in combined form owing to their high reactivity.
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