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The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Because alkali metals are so reactive, they are found in nature only in combination with other elements.
Rating Newest Oldest. Best Answer: Alkali metals are reactive because of their ionization energies. Ionization energy is the energy required to remove one electron from the atom. Alkali metals have only one valence electron, and if you'll recall all atoms want to be noble gases, i.e. they want full valence shells.ating Newest Oldest. Best Answer: Alkali metals are reactive because of their ionization energies. Ionization energy is the energy required to remove one electron from the atom. Alkali metals have only one valence electron, and if you'll recall all atoms want to be noble gases, i.e. they want full valence shells.