Barium
56
Ba
Barry
![Barry](http://elemonster.de/sites/default/files/styles/large/public/field/image/056_Barium-01.png?itok=GMvMO3Wo)
The name barium is derived from the Greek word barys, meaning "heavy", because of the density of its mieral baryte. It has only a few special technical applications. Barium is essential only for a particular species of green algae.