+**Caesium** is a soft, silvery-gold [alkali metal](/wiki/alkali_metal), the heaviest of its stable brethren. Highly reactive, it finds its most precise purpose ticking away the seconds in [atomic clocks](/wiki/atomic_clock).
+## See also
+- [Metal](/wiki/metal)
+- [Element](/wiki/element)
+- [Periodic table](/wiki/periodic_table)
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