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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.
1 The alkali metals make up group 1 of the Table, and comprise Li through Fr. They have very similar behavior and characteristics. 2  Hydrogen is group 1 but exhibits few characteristics of a metal and is often categorized with the nonmetals. 3  Alkaline earth metals.