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id="cse-search-box"> <div> <input type="hidden" name="cx" value="partner-pub-9334432533380510:6223510783"> <input type="hidden" name="ie" value="UTF-8"> <input type="text" name="q" size="28"> <input type="submit" name="sa" value="Search"> </div> </form> <script> </script> </div> </div> </div> <main> <div class="pure-g"> <div class="pure-u-1 pure-u-sm-1-1"> <h1 class="p">Boron - <sub><small>5</small></sub>B: reactions of elements</h1> <div class="pure-menu pure-menu-horizontal pure-menu-scrollable"> <ul class="pure-menu-list z_menu"> <li class="pure-menu-item p"><a href="../boron/" class="pure-menu-link">▸▸ B Essentials</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/physics.html">Physical properties</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/atoms.html">Electron shell data</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/atom_sizes.html">Atom sizes</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/electronegativity.html">Electronegativity</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/isotopes.html" >Isotopes and NMR</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/crystal_structure.html">Crystal structure</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/thermochemistry.html">Thermochemistry</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/history.html">History</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/uses.html">Uses</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/geology.html">Geology</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/biology.html">Biology</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/compounds.html">Binary compounds</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/compound_properties.html" >Compound properties</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/chemistry.html">Element reactions</a></li> <li class="pure-menu-item p"><a class="pure-menu-link" href="../boron/contents.html">List all B properties</a></li> </ul> </div> </div> </div> <h2 class="p">Reaction of boron with air</h2> <p class="p_first">The behaviour of boron to air depends upon the crystallinity of the sample, temperature, particle size, and purity. By and large, boron does not react with air at room temperature. At higher temperatures, boron does burn to form boron (III) oxide, B<sub>2</sub>O<sub>3</sub>.</p> <p class="equation">4B + 3O<sub>2</sub>(g) → 2B<sub>2</sub>O<sub>3</sub>(s)</p> <h2 class="p">Reaction of boron with water</h2> <p class="p_first">Boron does not react with water under normal conditions.</p> <h2 class="p">Reaction of boron with the halogens</h2> <p class="p_first">Boron reacts vigorously with the halogens fluorine, F<sub>2</sub>, chlorine, Cl<sub>2</sub>, bromine, Br<sub>2</sub> to to form the trihalides boron(III) fluoride, BF<sub>3</sub>, boron(III) chloride, BCl<sub>3</sub>, and boron(III) bromide, BBr<sub>3</sub> respectively.</p> <p class="equation">2B(s) + 3F<sub>2</sub>(g) → 2BF<sub>3</sub>(g)</p> <p class="equation">2B(s) + 3Cl<sub>2</sub>(g) → 2BCl<sub>3</sub>(g)</p> <p class="equation">2B(s) + 3Br<sub>2</sub>(g) → 2BF<sub>3</sub>(l)</p> <h2 class="p">Reaction of boron with acids</h2> <p class="p_first">Crystalline boron does not react with boiling hydrochloric acid, HCl, or boiling hydrofluoric acid, HF. Powdered boron oxidizes slowly when treated with concentrated nitric acid, HNO<sub>3</sub>.</p> <h2 class="p">Reaction of boron with bases</h2> </main> <div id="footer"> <footer> <div class="footer"> <div class="pure-g"> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Key properties</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/eneg_pauling/">Electronegativity </a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/melting_point/">Melting point</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/density/">Density </a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/molar_volume/">Molar volume</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/ionis_energy_1/">Ionization energy (1st)</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/covalent_radius/">Covalent radius</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/metallic_radius/">Metallic radius</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/abund_crust/">Abundance: earth's crust</a></li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Shop</li> <li class="pure-menu-item">Sorry, shop closed</li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Social</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.facebook.com/webelements.periodic.table">Facebook</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://twitter.com/periodic_table">Twitter</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.pinterest.com/periodictable/">Pinterest</a></li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Administration</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/your-privacy/" title="Your privacy">Privacy</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/about-webelements/" title="About WebElements">About</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/webelements-and-copyright/" title="Copyright information about WebElements">Copyright</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/acknowledgements/" title="Acknowledgements">Thanks...</a></li> </ul> </div> </div> </div> <address> <p> <a href="https://www.webelements.com/"><img class="logo_m" src="../_media/icons/logo_60.png" alt="WebElements home" /></a><br /> <strong>WebElements:</strong> THE periodic table on the WWW [<a href="https://www.webelements.com/">www.webelements.com</a>]<br /> <a href="https://www.webelements.com/nexus/webelements-and-copyright/">Copyright </a> 1993-2024 <a href="https://winter.group.shef.ac.uk/">Mark Winter</a> [ <a href="https://www.sheffield.ac.uk/chemistry/">The University of Sheffield </a> and WebElements Ltd, UK]. 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