Name: barium
Symbol: Ba
Atomic number: 56
Atomic weight: 137.327 (7)
Group in periodic table: 2
Group name: Alkaline earth metal
Period in periodic table: 6
Block in periodic table: s-block
CAS registry ID: 7440-39-3
Barium is a metallic element, soft, and when pure is silvery white like lead. The metal oxidises very easily and it reacts with water or alcohol. Barium is one of the alkaline-earth metals. Small amounts of barium compounds are used in paints and glasses.