Sodium belongs to the chemical elements belonging to group 1 i.e. alkali metals. Lithium, rubidium, cesium, francium, potassium are other members of group I of the periodic table. Occurrence of Sodium: About 2.27% of sodium is present in the earth’s crust. Sodium is the seventh most existing element on the earth while fifth most known metal after aluminum, calcium, iron and magnesium. In the ocean 1.08×104 milligrams/liter. Sodium has never been found as a pure element because of its high reacting power. In many soluble minerals sodium is also present like natron and halite while in less soluble minerals like zeolite
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