+Cesium is a soft, silvery-gold [alkali metal](/wiki/Alkali_metal), noted for its extreme reactivity. It is the most electropositive naturally occurring element, giving it unique properties, and its stable isotopes define the second in [atomic clocks](/wiki/Atomic_clock).
+## See also
+- [Element](/wiki/Element)
+- [Periodic Table](/wiki/Periodic_Table)
+- [Francium](/wiki/Francium)
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