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sodium
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Periodic table showing sodium Sir Humphry Davy sodium-vapour lamp bulb Explore an interactive periodic table of the elements sodium chloride sodium bicarbonate evaporator first ionization energies of the elements hydration of a sodium ion ionic bond: sodium chloride, or table salt
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Periodic table showing sodium
Periodic table showing sodium

sodium

chemical element
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Also known as: Na, natrium
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sodium (Na), chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table. Sodium is a very soft silvery-white metal. Sodium is the most common alkali metal and the sixth most abundant element on Earth, comprising 2.8 percent of Earth’s crust. It occurs abundantly in nature in compounds, especially common salt—sodium chloride (NaCl)—which forms the mineral halite and constitutes about 80 percent of the dissolved constituents of seawater. atomic number 11 atomic weight 22.9898 melting point 97.81 °C (208 °F) boiling point 882.9 °C (1,621 °F) specific gravity 0.971 (20 °C) oxidation states +1, −1 (rare) electron ...(100 of 3118 words)

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