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56 Ba Barium

Alkaline earth metal, mass: 137.33 u, 7 stable isotopes (130, 132, 134, 135, 136, 137, 138), abundance rank (earth/space): 19/41

Click image to magnify. 1.5 grams barium with a grey oxide layer under argon. Original size in cm: 0.7 x 1
Barium Barium with oxide layer
Barium is a very reactive, silvery metal, which quickly oxidizes in air and easily starts to burn. Therefore elementary barium is hardly used except as a getter material, which binds unwanted rest gases in vacuum tubes. Barium compounds are scarcely used, too, water soluble compounds of it are toxic. The non-water-soluble barium sulfate, known as barium meal, is used as a radiographic contrast medium. Barium salts make fireworks green.

Piece of barium Piece of barium under argon



Creative Commons License The images are licensed under a Creative Commons Attribution 3.0 Unported License, unless otherwise noted. Attribution by linking to the according element page.


Page last changed on March 05. 2010

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