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Lithium

Lithium is the chemical element with symbol Li and atomic number 3.

In the periodic table, it is located in group 1, among the alkali metals.

Lithium in its pure form is a soft, silver white metal, that tarnishes and oxidizes very rapidly in air and water.

It is the lightest solid element and is primarily used in heat transfer alloys, in batteries and serves as a component in some drugs known as mood stabilizers.

Note:   The above text is excerpted from the Wikipedia article "Lithium", which has been released under the GNU Free Documentation License.
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May 23, 2015

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