Element overview
Boron (B) is element 5 with a listed atomic mass of 10.81 u. It is in group 13 and period 2. Its category is metalloid.
Atomic properties
Electron configuration: [He] 2s2 2p1. Electronegativity: 2.04. Common oxidation states: +3.
Physical properties
Density: 2.34; melting point: 2349; boiling point: 4200. Values depend on conditions, phase and source.