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href="../zinc/chemistry.html">Zinc</a></li> <li class="pure-menu-item d"><a class="pure-menu-link d" href="../zirconium/chemistry.html">Zirconium</a></li> </ul> </div> </div>  <div class="pure-g"> <div class="pure-u-1"> <div class="pure-menu pure-menu-open pure-menu-horizontal centre" role="navigation" style="background: #000 url(../_media/elements/discharge/Ac.png) repeat-y center; background-size:contain;"> <span><a class="pure-menu-heading" href="https://winter.group.shef.ac.uk/webelements/"><img height="30" src="../_media/icons/logo_60.png" alt="WebElements logo"></a> <a class="white" href="./">Actinium - <sub>89</sub>Ac</a>  <audio id="myAudio_f"> <source src="../_media/elements/snds_f/Ac.mp3" type="audio/mpeg">Your user agent does not support the HTML5 Audio element. </audio> <button class="pure-button f_button" style=" display: inline;" type="button" onclick="audf_play_pause()"> 🔊  </button> <script> function audf_play_pause() { var myAudiof = document.getElementById("myAudio_f"); if (myAudiof.paused) { myAudiof.play(); } else { myAudiof.pause(); }} </script></span> </div> </div> </div> <div id="main">  <div class="pure-u-1 pure-u-sm-1-1"> <div class="pure-menu pure-menu-horizontal pure-menu-scrollable"> <a href="#" class="pure-menu-link pure-menu-heading">▸▸</a> <ul class="pure-menu-list"> <li class="pure-menu-item">🇬🇧 Actinium</li> <li class="pure-menu-item">🇺🇦 Актиній</li> <li class="pure-menu-item">🇨🇳 錒</li> <li class="pure-menu-item">🇳🇱 Actinium</li> <li class="pure-menu-item">🇫🇷 Actinium</li> <li class="pure-menu-item">🇩🇪 Actinium</li> <li class="pure-menu-item">🇮🇱 אקטיניום</li> <li class="pure-menu-item">🇮🇹 Attinio</li> <li class="pure-menu-item">🇯🇵 アクチニウム</li> <li class="pure-menu-item">🇵🇹 Actínio</li> <li class="pure-menu-item">🇪🇸 Actinio</li> <li class="pure-menu-item">🇸🇪 Aktinium</li> <li class="pure-menu-item">🇷🇺 Актиний</li> </ul> </div> </div> <div class="pure-g"> <div class="pure-u-1 pure-u-sm-1-1"> <div class="google_navbar_positioning"> <form action="https://www.google.com" 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="f">Actinium - <sub><small>89</small></sub>Ac: 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 f"><a href="../actinium/" class="pure-menu-link">▸▸ Ac Essentials</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/physics.html">Physical properties</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/atoms.html">Electron shell data</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/atom_sizes.html">Atom sizes</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/electronegativity.html">Electronegativity</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/isotopes.html" >Isotopes and NMR</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/crystal_structure.html">Crystal structure</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/thermochemistry.html">Thermochemistry</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/history.html">History</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/uses.html">Uses</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/geology.html">Geology</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/biology.html">Biology</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/compounds.html">Binary compounds</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/compound_properties.html" >Compound properties</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/chemistry.html">Element reactions</a></li> <li class="pure-menu-item f"><a class="pure-menu-link" href="../actinium/contents.html">List all Ac properties</a></li> </ul> </div> </div> </div> <h2 class="f">Reaction of actinium with air</h2> <p class="p_first">Actinium metal tarnishes slowly in air and burns readily to form actinium (III) oxide, Ac<sub>2</sub>O<sub>3</sub>.</p> <p class="equation">4Ac + 3O<sub>2</sub> → 2Ac<sub>2</sub>O<sub>3</sub></p> <h2 class="f">Reaction of actinium with water</h2> <h2 class="f">Reaction of actinium with the halogens</h2> <h2 class="f">Reaction of actinium with acids</h2> <h2 class="f">Reaction of actinium with bases</h2> </main> <div id="footer"> <footer> <div 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