56 Ba 137.3277
Barium
ALKALINE EARTH METAL
Phase: Solid
Discovered: Carl Wilhelm Scheele
Block: S
Summary
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.
Source: WikipediaPhysical Properties
Atomic Mass 137.3277 u
Density 3.51 g/cm³
Melting Point 1000 K
Boiling Point 2118 K