Tesaurus d'Art i Arquitectura Getty Institute 0000-00-00 2024-01-24 15:40:44 en boron300264228B Non-metallic solid element, atomic number 5, symbol B, with several specialized uses, such as in alloy steels, in semiconductors, and in commercially valuable compounds such as borax and boric acid. It is usually prepared as a brown powder, but when very pure it forms hard, shiny, dark crystals. bor boron (traducció pendent) 2026-03-30 20:26:23