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Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. The hydroxide, known in pre-modern history as baryta, does not occur as a mineral, but can be prepared by heating barium carbonate.
Barium chloride is the inorganic compound with the formula Ba Cl2. It is one of the most common water-soluble salts of barium.Like other barium salts, it is toxic and imparts a yellow-green coloration to a flame.arium chloride is the inorganic compound with the formula Ba Cl2. It is one of the most common water-soluble salts of barium.