5 B Boron
Metalloid, mass: 10.81 u, 2 stable isotopes (10, 11), abundance rank (earth/space): 37/26Click image to magnify. Pure crystalline boron, front and back side. Original size in cm: 2 x 3
Boron is a rare element and is found in nature only in compounds together with oxygen. Crystalline boron, which is shown here, is nearly as hard as diamond (9.5 on Mohs scale, diamond has 10). Boron compounds have many, often very special applications. Most famous probably are the perborates as bleach and as washing agent. Because of their bad biodegradability, the use of perborates fortunately has gone back.
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Page last changed on January 14. 2010
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