+Sodium (Na) is a soft, silvery-white [Alkali Metal](/wiki/Alkali_Metal), an essential [Element](/wiki/Element) found abundantly in Earth's crust and oceans. It plays a crucial role in biological systems, vital for nerve impulse transmission and maintaining fluid balance.
+## See also
+- [Periodic Table](/wiki/Periodic_Table)
+- [Electrolyte](/wiki/Electrolyte)
+- [Salt](/wiki/Salt)
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