+Rubidium is a soft, silvery-white [Alkali Metal](/wiki/alkali_metal) from the [Periodic Table](/wiki/periodic_table), known for its extreme reactivity. This highly metallic element ignites spontaneously in air and reacts explosively with water, finding use in atomic clocks and specialized photocells.
+## See also
+- [Cesium](/wiki/cesium)
+- [Potassium](/wiki/potassium)
+- [Atomic Clock](/wiki/atomic_clock)
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