Barium metal（Cat No.:R071151）is a soft, silvery-white alkaline earth metal with the atomic number 56 and the symbol Ba. Highly reactive, especially with air and moisture, it quickly forms a protective layer of barium oxide when exposed. Due to its reactivity, barium is typically stored under oil or in an inert atmosphere. It is used in specialized applications such as in vacuum tube technology, pyrotechnics (for green flames), and as a getter to remove residual gases. Barium metal also plays a role in certain alloys and scientific research involving heavy alkaline earth elements.