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The Group 1 elements were given the name "alkali" (not alkaline) because they react with water to form hydroxide ions, creating a basic, or alkaline solution with a pH greater than 7.

For example: 2Na(s) + 2H2O ---> 2NaOH(aq) + H2(g)

As you move down the group, the reactivity increases. The reaction with water is exothermic and can ignite the hydrogen gas that forms in the reaction.

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