Sodium is a soft bright silvery metal that floats on water. It, like every other very reactive element is never found free in nature. Decomposition in water results in the evolution of hydrogen. Depending on the amount of oxide and metal exposed to the water, it may or may not ignite in air temperature below 115 C.

Metallic sodium may be used to improve the structure of certain alloys, descale metal, and purify molten metals. NaK, sodium with potassium, an alloy is an important heat transfer agent. Sodium compounds are important to the paper, glass, soap, textile, petroleum, chemical, and metal industries. Generally soap is a sodium salt of certain fatty acids. The importance of common salt to animal nutrition has been know since prehistoric times. (University of California)

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