Barium (Ba) has an atomic number of 56 and its mass number is 137.328. The period number is 6. It's group name is Alkaline Earth Metals therefore making its group number 2. It is a solid and is a metal.
Barium is used in paint.
Barium is used in forms of glassmaking. (this was the best picture I could find)
Drilling fluids for oil and gas wells
Barium is also used in drilling fluids for oil and gas wells