These metals have only one electron in their outer shell. Therefore, they are ready to lose that one electron in ionic bonding with other elements. The alkali metals are lithium, sodium, potassium, rubidium, cesium, and francium. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. Cesium and francium are the most reactive elements in this group.
Alkali metals can explode if they are exposed to water.
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