'''Lithium''' is an [[element]] in the [[alkali metal]]s class of the [[periodic table]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> It is the lightest [[solid]] element -- about half the [[density]] of [[water]]. Like the other alkali metals, lithium reacts violently with water; it is usually stored in oil.
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'''Lithium''' is an [[element]] in the [[alkali metal]]s class of the [[periodic table]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> It is the lightest [[solid]] element -- about half the [[density]] of [[water]]. Like the other alkali metals, lithium reacts violently with water; it is usually stored in oil. Lithium tablets are frequently used in the treatment of [[bipolar disorder]] and some other mental health conditions.