What is SODIUM?

A metallic element, one of the alkali metals. Symbol Na, at no 11, ram 22-9898, mp 97-5'C, bp 883 C, rel.d. 0-978, valency 1. Sodium does not occur in nature in the free state and is a soft silvery-white metal, which reacts violently with water. Sodium is the seventh commonest element in the Earth

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