Barium
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Barium is a chemical element, having the chemical symbol Ba. Its atomic number (the number of protons) is 56. It has a standard atomic weight of 137.327 g•mol −1 and is a solid in its elemental form.
Barium is considered to be a member of the "Alkaline earth metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 1,897 °C and a melting point of 727 °C.