Barium was discovered in 1808. Like calcium and magnesium, barium is found in minerals and in the sea. Barium occurs in substantial deposits of barytes, BaSO4.

Barium is mainly used in:

Shown above is a sample of barium in argon. Storing barium in argon minimizes oxidation of the sample.

BCIT Chemistry Resource Center
http://nobel.scas.bcit.ca/resource/