metallic element,
metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
barium -
A metallic chemical element symbol Ba with an atomic number of 56.
Wikipedia
Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Barium is never found in nature in its pure form due to its reactivity with air.
OmegaWiki Dictionary
Ω
barium A soft silvery-white metallic element of the alkaline earth group. It has the symbol Ba, and atomic number 56. It is used in bearing alloys and compounds are used as pigments.\n(Source: CED)