A fiery temperament of alkali metals

Chemistry Level 1

The alkali metals are a group in the periodic table consisting of the chemical elements lithium (Li\ce{Li}), sodium (Na\ce{Na}), potassium (K\ce{K}), rubidium (Rb\ce{Rb}), cesium (Cs\ce{Cs}), and francium (Fr\ce{Fr}). Because of their high reactivity, they must be stored under oil to prevent reaction with air. They are found naturally only in salt and never as a free element. Which of following best explains their high reactivity?

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