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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.
The element was called barium because it was found in barite (barium sulfate) a mineral given its name because of its high density. The Greek âbarysâ means heavy. Bariumâs Periodic Table Neighborhood. Barium sits close to the bottom of the periodic tableâs Group 2.he element was called barium because it was found in barite (barium sulfate) a mineral given its name because of its high density. The Greek âbarysâ means heavy. Bariumâs Periodic Table Neighborhood. Barium sits close to the bottom of the periodic tableâs Group 2.