: Paléoclimatologie: boron

study material > chemical object > chemical element > boron

boron

Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the boron group it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral borax, and the ultra-hard crystal boron carbide. Boron is synthesized entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and in the Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust. (Adapted from: https://en.wikipedia.org/wiki/Boron)

http://data.loterre.fr/ark:/67375/QX8-SWF3TG3F-Z

RDF/XML TURTLE JSON-LD

Loterre