Atomic Number: 56

Protons: 56

Electrons: 56

Neutrons: 81

Average Atomic Mass: 137.327amu

Isotopes: Barium-128, Barium-129, Barium-130, Barium-131, Barium-132, Barium-133, Barium-134, Barium-135, Barium-136, Barium-137, Barium-138, Barium-139, and Barium-140

Discovery: Barium was first discovered by Sir Humphrey Davy in England in 1808.

Name: The origin of the name came from the Greek word "barys" meaning "heavy".

Uses: Barium is used for rat poison,in oil well drilling fluids, and in making rubber, for glassmaking.

Interesting Facts: Barium is a silvery white metal. The surface of barium metal is covered with a thin layer of oxide that helps protect the metal from attack by air, but to a less extent than the corresponding layer in magnesium. Once ignited, barium metal burns in air to give a mixture of white barium oxide and barium nitride.