Barium | chemical element | Britannica
Barium (Ba), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. The element is used in metallurgy, and its compounds are used in pyrotechnics, petroleum production, and radiology. atomic number 56 atomic weight 137.33 melting point 727 °C (1,341 °F) boiling
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