Barium
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Barium is a chemical element, having the chemical symbol Ba.
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Its atomic number (the number of protons) is 56. It has a Standard Atomic Weight of 137.327(7), and is typically found as a solid in its elemental form.
Barium is considered to be a member of the "Alkaline Earth Metal" class of elements, has a boiling point of 1,897 °C , and a melting point of 727 °C .