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Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in Group 2. Barium is a soft silvery metallic alkaline earth metal. It is never found in nature in its pure form due to its reactivity with air.
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"Barium is used as a “flashed getter” in vacuum tubes to remove the last traces of gases."
http://www.chemicool.com/elements/barium.html
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"Barium compounds are also used to make paint, bricks, tiles, glass, and rubber."
http://www.lenntech.com/periodic/elements/ba.htm
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