This document provides information about the chemical element boron. It states that boron has an atomic number of 5, atomic mass of 10.811, melting point of 2,076 degrees Celsius, and boiling point of 3,927 degrees Celsius. Boron is a semi-metal with a rhombic crystal structure and density of 2.460 g/cc. It was discovered in 1808 by Sir Humphry Davy and J.L. Gay-Lussac and is used to produce green colors in pyrotechnics, as an ignition source in rockets, and in controlling nuclear reactors.