Which group of elements includes the most reactive of all the metallic elements

Question

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Alkali metals, such as lithium, sodium, and potassium, are known to be extremely reactive because they have only one valence electron in their outermost shell, making it easy for them to lose that electron and form a positive ion. This reactivity increases as you move down the group in the periodic table, with francium (the heaviest alkali metal) being the most reactive of them all.

Which Group of Elements Includes the Most Reactive of All