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Boron melts at 2349 [[Kelvin]] (K) and boils at 4200K. Pure boron comes in two forms: a brown powder or a black, non-conductive crystal.
Boron melts at 2349 [[Kelvin]] (K) and boils at 4200K. Pure boron comes in two forms: a brown powder or a black, non-conductive crystal.
==Isotopes==
There are two stable [[isotopes]] of boron - <sup>10</sup>B and <sup>11</sup>B - and eleven short-lived radioactive isotopes. The most common isotope is <sup>11</sup>B, with a prevalence of 80.1%. Due to their very short half-lives the radioisotopes are rarely found in nature.
==Occurrence in Nature==
Only about 0.001% of Earth's crust consists of boron. The two main producers of commercial boron are the USA and Turkey, with Turkey having about 72% of teh known commercially viable deposits. Due to its reactivity boron is not found in elemental form, but is commercially extracted from a number of compounds including borax and boric acid.
==References==
==References==
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