#56 Barium

Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element.

Atomic mass:137.327 amu

Melting point:725.0 C (998.15 K, 1337.0 F)

Boiling point:1140.0 C (1413.15 K, 2084.0 F)

Density:293 K: 293 K: 3.51 g/cm3