CORPORATE BORON GLOBAL PRODUCTS MEDIA CONTACT English Deutsch BORON ELEMENT Home > BORON ELEMENT BORON BORON ELEMENT BORATE MINERALS AREAS OF USE BORON IN TURKEY BORON AROUND THE WORLD R&D Industrial Mineral Boron A New Vision of Boron Boron is an element on the periodic table with symbol B, atomic number 5, and atomic weight 10.81. Located in the 3A group of the periodic table, boron is a semiconductor metalloid. Boron occurs naturally in the form of two stable isotopes, namely B10 and B11. For the B10 isotope, the natural rate of occurrence is 19.1–20.3%, whereas for the B11 it is 79.7–80.9%. Chemically unbound boron cannot be found naturally on Earth. It forms compounds with various metallic and non-metallic elements of different characteristics. Thus, many boron compounds can be used in different industries. When forming other compounds, boron acts like a non-metallic compound. Pure boron, on the other hand, is an electrical conductor just like carbon. Optically and visually, crystallized boron exhibits structures like diamonds and it is almost equally hard. Pure boron was first isolated by the French chemists, J.L. Gay-Lussac and Baron L.J. Thenard, and the British chemist, H. Davy, in 1808. ATOMIC STRUCTURE Atomic radius: 1.17 Å Atomic volume: 4.6 cm3/mol Crystal structure: Rhombohedral Electron configuration: 1s2 2s2 p1 Ionic radius: 0.23 Å Number of electrons (neutral): 5 Number of neutrons: 6 Number of protons: 5 Valence electrons: 2s2 p1 CHEMICAL PROPERTIES Electrochemical equivalence: 0.1344 g/amp-hr Electronegativity (Pauling): 2.04 Heat of fusion: 50.2 kJ/mol Ionization potential: First: 8.298 Second: 25.154 Third: 37.93 Valence electron potential (-eV): 190 PHYSICAL PROPERTIES Atomic mass: 10.811 Boiling point: 4.275 K – 4.002 °C – 7.236 °F Thermal expansion coefficient: 0.0000083 cm/cm/°C (0 °C) Conductivity: Electrical: 1.0 E –12,106/cm Thermal: 0.274 W/cmK Density: 2.34 g/cc @ 300 K Appearance: Yellow-brown non-metallic crystal Elastic modulus: Bulk: 320/GPa Enthalpy of atomization: 573.2 kJ/mol @ 25 °C Enthalpy of fusion: 22.18 kJ/mol Enthalpy of vaporization: 480 kJ/mol Hardness: Mohs: 9.3 Vickers: 49,000 MN m-2 Heat of vaporization: 489.7 kJ/mol Fusion temperature: 2,573 K – 2,300 °C – 4,172 °F Molar mass: 4.68 cm3/mol Phase at STP (20 °C & 1 atm): Solid Specific heat: 1.02 J/gK Vapor pressure: 0.348 Pa @ 2,300 °C AB Etiproducts OY Piispanportti 5, 02240 Espoo, Finland Telephone Telephone: +358 98194440 Fax: +358 981944444 E-mail sales@etiproducts.com ABOUT US EtiProducts History Mission, Vision and Values Documents POLICIES Environment Quality (EYS) Human Resources Occupational Health and Safety BORON Boron Element Borate Minerals Boron in Turkey Boron Arround The World R&D R&D Project Laboratories Projects Idea Platform GLOBAL Overseas Subsidiaries FACILITIES Kırka Emet Bandırma Bigadiç PRODUCTS Refined Borates NATURAL BORATES Etidot-67 EtiGranül Zinc Borate AREAS OF USE USAGE OF BORON Agriculture Cleaning Metallurgy Ceramic Wood Preservation Glass Insulation Textile Fiberglass Health Energy Other Fields MEDIA News Corporate Identity Photographs Videos CONTACT Addresses Contact Form Tweets by Etimaden ® 2018 Eti Maden Bestimage