This article has been reviewed and approved by the following Topic Editor: Sidney Draggan (other articles)
Boron is a semi-metallic element, exhibiting some properties of a metal and some of a non-metal. Its atomic number is 5 and its chemical symbol is B. In elemental form it is a dark, amorphous, unreactive solid. (An amorphous substance is one that does not form crystals.)
Boron is used mainly not as the element boron, but as compounds of boric oxide (B2O3) and boric acid (H3BO3). Most people have never seen elemental boron.