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Chemical element boron has the atomic number 5 and the letter B in its symbol. It is an amorphous brown powder and a brittle, ebony, glossy metalloid in its crystalline form. The boron group's lightest element, boron, has three valence electrons, sanctioning it to compose covalent bonds and engender a variety of compounds, including boric acid, sodium borate, and the very hard crystals of boron carbide and boron nitride.

Boron is a low-abundance element in the Solar System and the Earth's crust because it is solely engendered by cosmic ray spallation and supernovae rather than by star nucleosynthesis. It makes up around 0.001 percent of the crust's weight. It is concentrated on Earth due to the borate minerals, which are some of its most prevalent naturally occurring components. Evaporites like borax and kernite are mined for industrial use. Turkey, the country that engenders the most boron minerals, has the greatest kenned reserves.

Minuscule quantities of the metalloid elemental boron are discovered in meteoroids, but otherwise boron is not found in nature on Earth. Due to contamination from carbon or other elements that are arduous to abstract, the engenderment of the highly pristine element is challenging on an industrial scale.

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