Element · Layer 0, Atomic number 11
Sodium
A soft, highly reactive metal found in table salt, used as soda ash to make glass and in many other chemicals.
Also called natrium
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About
Sodium is a soft, silvery metal that can be cut with a knife and reacts violently with water. It is never found free in nature, but its compounds are everywhere: seawater is full of sodium chloride, ordinary table salt. Humphry Davy first isolated the metal in 1807 by passing electricity through melted caustic soda.
Most sodium is used as compounds rather than metal. In the television it appears as sodium carbonate, or soda ash, which is mixed into soda-lime glass to lower the temperature at which sand melts. The pure metal is used to make some chemicals, and sodium vapor gives older street lamps their yellow-orange glow.
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