Astatine | AMERICAN ELEMENTS®

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class="tbm-subnav level-2 items-36" role="list"> <li class="tbm-item level-3 menu-item-bold" aria-level="3" > <div class="tbm-link-container"> <a href="/products-by-element" class="tbm-link level-3"> All Elements <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/al.html" class="tbm-link level-3"> Aluminum <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/sb.html" class="tbm-link level-3"> Antimony <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/as.html" class="tbm-link level-3"> Arsenic <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ba.html" class="tbm-link level-3"> Barium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/be.html" class="tbm-link level-3"> Beryllium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/bi.html" class="tbm-link level-3"> Bismuth <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/bb.html" class="tbm-link level-3"> Boron <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/bromine.html" class="tbm-link level-3"> Bromine <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/cd.html" class="tbm-link level-3"> Cadmium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ca.html" class="tbm-link level-3"> Calcium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/cc.html" class="tbm-link level-3"> Carbon <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ce.html" class="tbm-link level-3"> Cerium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/cs.html" class="tbm-link level-3"> Cesium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/chlorine.html" class="tbm-link level-3"> Chlorine <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/cr.html" class="tbm-link level-3"> Chromium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/co.html" class="tbm-link level-3"> Cobalt <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/cu.html" class="tbm-link level-3"> Copper <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/dy.html" class="tbm-link level-3"> Dysprosium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/er.html" class="tbm-link level-3"> Erbium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/eu.html" class="tbm-link level-3"> Europium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/fluorine.html" class="tbm-link level-3"> Fluorine <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/gd.html" class="tbm-link level-3"> Gadolinium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ga.html" class="tbm-link level-3"> Gallium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ge.html" class="tbm-link level-3"> Germanium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/au.htm" class="tbm-link level-3"> Gold <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/hf.html" class="tbm-link level-3"> Hafnium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ho.html" class="tbm-link level-3"> Holmium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/in.html" class="tbm-link level-3"> Indium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ii.htm" class="tbm-link level-3"> Iodine <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ir.html" class="tbm-link level-3"> Iridium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/fe.html" class="tbm-link level-3"> Iron <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/la.html" class="tbm-link level-3"> Lanthanum <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/pb.html" class="tbm-link level-3"> Lead <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/li.html" class="tbm-link level-3"> Lithium <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3 menu-item-bold" aria-level="3" > <div class="tbm-link-container"> <a href="/products-by-element" class="tbm-link level-3"> More… <span class="tbm-caption">Array</span> </a> </div> </li> </ul> </div> </div> </div> </div> </li> <li class="tbm-item level-2 tbm-group" aria-level="2" > <div class="tbm-link-container"> <span class="tbm-link level-2 no-link tbm-group-title" tabindex="0" aria-expanded="false"> Products by Form <span class="tbm-caption">Array</span> </span> </div> <div class="tbm-group-container tbm-item-child" role="list"> <div class="tbm-row"> <div class="tbm-column span12"> <div class="tbm-column-inner"> <ul class="tbm-subnav level-2 items-18" role="list"> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/2d-materials" class="tbm-link level-3"> 2D Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/alloys.html" class="tbm-link level-3"> Alloys <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/alloys.html" class="tbm-link level-3"> Alloy Forms <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ceramic-fibers" class="tbm-link level-3"> Ceramic Fibers <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/ceramics.html" class="tbm-link level-3"> Ceramics <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/chemicals.html" class="tbm-link level-3"> Chemicals & Salts <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/foams.html" class="tbm-link level-3"> Foams <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/Ultra_high_purity_metals_powders.htm" class="tbm-link level-3"> High Purity Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/isotopes.html" class="tbm-link level-3"> Isotopes <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/metals.html" class="tbm-link level-3"> Metal Forms <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/mxenes" class="tbm-link level-3"> Mxenes <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/nanomaterials-nanoparticles-nanotechnology.html" class="tbm-link level-3"> Nanomaterials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/organometallics.html" class="tbm-link level-3"> Organometallics <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/oxides.html" class="tbm-link level-3"> Oxides <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/metals.html" class="tbm-link level-3"> Pure Metals <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/rare-earths.html" class="tbm-link level-3"> Rare Earths <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/semiconductors.html" class="tbm-link level-3"> Semiconductors <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/solutions" class="tbm-link level-3"> Solutions <span class="tbm-caption">Array</span> </a> </div> </li> </ul> </div> </div> </div> </div> </li> <li class="tbm-item level-2 tbm-group" aria-level="2" > <div class="tbm-link-container"> <span class="tbm-link level-2 no-link tbm-group-title" tabindex="0" aria-expanded="false"> Products by Application <span class="tbm-caption">Array</span> </span> </div> <div class="tbm-group-container tbm-item-child" role="list"> <div class="tbm-row"> <div class="tbm-column span12"> <div class="tbm-column-inner"> <ul class="tbm-subnav level-2 items-30" role="list"> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/additive-manufacturing-3d-printing" class="tbm-link level-3"> 3D Printing <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/additive-manufacturing-3d-printing" class="tbm-link level-3"> Additive Manufacturing <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/green-technology-alternative-energy.html" class="tbm-link level-3"> Alternative Energy <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/Battery-Technology.html" class="tbm-link level-3"> Battery Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/Bio-Medical.html" class="tbm-link level-3"> Biomaterials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/catalysts" class="tbm-link level-3"> Catalysts <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/dental-materials.html" class="tbm-link level-3"> Dental Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/electronics-materials.html" class="tbm-link level-3"> Electronics Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/fuel-cell-materials.html" class="tbm-link level-3"> Fuel Cell Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/fusion-energy" class="tbm-link level-3"> Fusion Energy <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/optical-materials.html" class="tbm-link level-3"> Glass Manufacturing <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/green-technology-alternative-energy.html" class="tbm-link level-3"> Green Technology <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/Hydrogen-Storage.html" class="tbm-link level-3"> Hydrogen Storage <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/optical-materials.html" class="tbm-link level-3"> Laser Crystals <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/life-science-organic-chemistry" class="tbm-link level-3"> Life Sciences <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/metallurgy.html" class="tbm-link level-3"> Metallurgy <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/nanomaterials-nanoparticles-nanotechnology.html" class="tbm-link level-3"> Nanomaterials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/nanomaterials-nanoparticles-nanotechnology.html" class="tbm-link level-3"> Nanotechnology <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/optical-materials.html" class="tbm-link level-3"> Optical Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/solar-energy-materials.html" class="tbm-link level-3"> Photovoltaics <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/pigments-coatings.html" class="tbm-link level-3"> Pigments & Coatings <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/metal-plating" class="tbm-link level-3"> Plating <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/research-and-development.html" class="tbm-link level-3"> Research & Development <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/solar-energy-materials.html" class="tbm-link level-3"> Solar Energy <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/space-industry.html" class="tbm-link level-3"> Space Technology <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/sputtering-targets.html" class="tbm-link level-3"> Sputtering Targets <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/Battery-Technology.html" class="tbm-link level-3"> Supercapacitor Materials <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/thin-film-evaporation-materials.html" class="tbm-link level-3"> Thin Film Deposition <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/water-treatment-chemicals.html" class="tbm-link level-3"> Water Treatment <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/weather-modification" class="tbm-link level-3"> Weather Modification <span class="tbm-caption">Array</span> </a> </div> </li> </ul> </div> </div> </div> </div> </li> <li class="tbm-item level-2 tbm-group" aria-level="2" > <div class="tbm-link-container"> <span class="tbm-link level-2 no-link tbm-group-title" tabindex="0" aria-expanded="false"> Life Science Products <span class="tbm-caption">Array</span> </span> </div> <div class="tbm-group-container tbm-item-child" role="list"> <div class="tbm-row"> <div class="tbm-column span12"> <div class="tbm-column-inner"> <ul class="tbm-subnav level-2 items-37" role="list"> <li class="tbm-item level-3 menu-item-bold" aria-level="3" > <div class="tbm-link-container"> <a href="/life-science-organic-chemistry" class="tbm-link level-3"> All Life Science <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/alcohols" class="tbm-link level-3"> Alcohols <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/aldehydes" class="tbm-link level-3"> Aldehydes <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/alkanes" class="tbm-link level-3"> Alkanes <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/amides" class="tbm-link level-3"> Amides <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/amines" class="tbm-link level-3"> Amines <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/amino-acids-derivatives" class="tbm-link level-3"> Amino Acids & Derivatives <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/aromatics" class="tbm-link level-3"> Aromatics <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/aryls" class="tbm-link level-3"> Aryls <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/azetidines" class="tbm-link level-3"> Azetidines <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/benzimidazoles" class="tbm-link level-3"> Benzimidazoles <span class="tbm-caption">Array</span> </a> </div> </li> <li class="tbm-item level-3" aria-level="3" > <div class="tbm-link-container"> <a href="/benzothiophenes" class="tbm-link level-3"> Benziothiophenes 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role="banner"> <div class="section layout-container clearfix"> </div> </header> <div class="highlighted"> <aside class="layout-container section clearfix" role="complementary"> <div> <div data-drupal-messages-fallback class="hidden"></div> </div> </aside> </div> <div id="main-wrapper" class="page-layout-main-wrapper layout-container clearfix"> <div id="main" class="layout-main clearfix container-fluid"> <main id="content" class="column main-content" role="main"> <section class="section"> <a id="main-content" tabindex="-1"></a> <div> <div id="block-ae-theme-gratis-ae-subtheme-system-main"> <article data-history-node-id="358324" class="elements"> <div class="element-main"> <div class="elements__banner "> <img src=/images/2024-08/astatine-banner.jpg /> </div> <h1 class="elements__banner__title"> <span>Astatine</span> </h1> <div class="elements__banner__properties"> <div class="elements__banner__properties--number">45</div> <div class="elements__banner__properties--symbol">At</div> <div class="elements__banner__properties--mass">210</div> </div> </div> <div class="elements__content"> <div class="ae-tabs"> <div class="ae-tabs-headers"> <a href="#about" class="ae-tabs-headers--header" data-tab="tab-about">About <div class="views-element-container"><div class="js-view-dom-id-cb0b1375749c0ff97c090c9ed5c17f7d078174d036f4f93bd92e57b535e39c6e"> <div class="all-items"> <div>Astatine</div> </div> </div> </div> </a> <a href="#products" class="ae-tabs-headers--header" data-tab="tab-products">Products</a> <a href="#properties" class="ae-tabs-headers--header active" data-tab="tab-properties">Properties</a> <a href="#properties-and-products" class="ae-tabs-headers--header" data-tab="tab-properties-and-products">Properties & Products</a> <a href="#safety" class="ae-tabs-headers--header" data-tab="tab-safety">Safety</a> <a href="#isotopes" class="ae-tabs-headers--header" data-tab="tab-isotopes">Isotopes</a> </div> <div class="ae-tabs-content"> <div id="tab-about" class="tab-body paragraph paragraph--type--about paragraph--view-mode--default"> <div class="paragraph text-with-title paragraph--type--text-with-title paragraph--view-mode--default"> <h2 class="text-with-title__title">About Astatine</h2> <div class="text-with-title__body"><div class="tab-pane active" id="about" role="tabpanel" aria-labelledby="tab1"><img class="image-left" src="https://www.americanelements.com/images_graphics/element-bohr-models/astatine-bohr-model.jpg" alt="Astatine Bohr" width="200" height="200"><p>With less than one gram present on earth at any given time, radioactive Astatine is the second rarest naturally-occurring element on the periodic table after <a href="https://www.americanelements.com/bk.html">berkelium</a>, and the rarest of the non-transuranic elements. Only six of astatine’s 37 known isotopes are naturally occurring; trace amounts of those with atomic numbers 214-219 are produced via decay chains of heavier elements like <a href="https://www.americanelements.com/francium.html">francium</a> and <a href="https://www.americanelements.com/po.html">polonium</a> and/or exist in equilibrium with isotopes of <a href="https://www.americanelements.com/uu.htm">uranium</a>, <a href="https://www.americanelements.com/th.html">thorium</a>, and <a href="https://www.americanelements.com/np.html">neptunium</a>. Its most stable isotope is 210-At, which has a half-life of 8.1 hours and decays to polonium-210; the least stable is 213-At, which decays to the <a href="https://www.americanelements.com/bi.html">bismuth</a>-209 after only 125 nanoseconds. Given its quick decay, the element has proven difficult to study. Any quantity of astatine sufficient to constitute a solid would vaporize instantaneously from its radioactive energy, so many of its properties are either unknown or estimated. The element is generally considered to be a member of the halogen family based on observed properties obtained via mass spectrometry and radioactive tracer experiments with dilute astatine solutions; it behaves similarly to <a href="https://www.americanelements.com/ii.htm">iodine</a>, though it is more metallic.</p><p>Mendeleev’s periodic table contained a blank spot beneath iodine for a theoretical element named “eka-iodine.” Scientists’ subsequent attempts to find the element in nature were fruitless, and the quest to synthesize it in the lab was fraught with false starts. Fred Allison and his team at Alabama Technical Institute (now <a href="https://www.americanelements.com/http%3A//www.auburn.edu">Auburn University</a>) were the first in a series of researchers to mistakenly claim discovery of the elusive element in 1931; their discredited “alabamine” was followed by Rajendralal De’s “dakin,” Walter Minder’s “helvetium,” and Mitter and Alice Leigh-Smith’s “anglo-helvetium.” In 1940, <a href="https://www.americanelements.com/http%3A//www.berkeley.edu">Berkeley</a> scientists Dale Corson, Kenneth Ross MacKenzie, and Emilio Segrè were finally successful in artificially producing 211-At by bombarding a <a href="https://www.americanelements.com/bismuth-sputtering-target-7440-69-9">bismuth sputtering target</a> with alpha particles in a particle accelerator. They named the element astatine from the Greek astatos, meaning “unstable.” Astatine was the second synthetic element to be conclusively identified, <a href="https://www.americanelements.com/tc.html">technetium</a> having been discovered by Segrè and Carlo Perrier three years earlier.</p><p>Corson, MacKenzie, and Segre’s method is still the primary means of synthesizing <sup>209-211</sup>At; the bismuth target is first cooled under <a href="https://www.americanelements.com/nitrogen.html">nitrogen</a> and then heated to vaporize traces of other radioisotopes, allowing the astatine to be distilled and collected on a cold finger. Several compounds of astatine have been synthesized in microscopic amounts: in addition to <a href="https://www.americanelements.com/hh.html">hydrogen</a> (hydrogen astatide, HAt, which forms hydroastatic acid when dissolved in water), astatine has been shown to bind to the other halides, <a href="https://www.americanelements.com/ag.html">silver</a>, <a href="https://www.americanelements.com/na.html">sodium</a>, <a href="https://www.americanelements.com/pd.html">palladium</a>, <a href="https://www.americanelements.com/oxygen.html">oxygen</a>, <a href="https://www.americanelements.com/sulfur.html">sulfur</a>, <a href="https://www.americanelements.com/se.html">selenium</a>, <a href="https://www.americanelements.com/nitrogen.html">nitrogen</a>, <a href="https://www.americanelements.com/pb.html">lead</a>, <a href="https://www.americanelements.com/bb.html">boron</a>, and <a href="https://www.americanelements.com/te.html">tellurium</a>, as a colloid. The first ionization energy of the astatine atom was unknown until 2013, when <a href="https://www.americanelements.com/https%3A//home.cern/">CERN</a> scientists used laser spectroscopy to measure it as 9.31751 electron volts (eV), which was confirmed by Canada's national laboratory for particle and nuclear physics <a href="https://www.americanelements.com/https%3A//www.triumf.ca/">TRIUMF</a>.</p><p>Astatine-211 is the element’s only commercially viable <a href="https://www.americanelements.com/isotopes.html">isotope</a>, its decay properties making it useful as a short-range radiation source for targeted alpha particle therapy in cancer treatment. Like <a href="https://www.americanelements.com/ii.htm">iodine-113</a>, it preferentially accumulates in the thyroid gland, but it decays faster and emits only alpha particles that have less of a tendency to migrate to surrounding tissue than the beta particles emitted by iodine-113.</p></div></div> </div> </div> <div id="tab-properties" class="tab-body paragraph paragraph--type--properties-element paragraph--view-mode--default"> <div class="paragraph text-with-title paragraph--type--text-with-title paragraph--view-mode--default"> <h2 class="text-with-title__title">Astatine Properties</h2> <div class="text-with-title__body"><div class="tab-pane active" id="properties" role="tabpanel" aria-labelledby="tab2"><p><img class="image-left" src="https://www.americanelements.com/images_graphics/astatine-bohr.jpg" alt="Astatine Bohr Model" width="200" height="200"><strong>Astatine</strong> is a Block P, Group 17, Period 6 element. The number of electrons in each of Astatine's shells is 2, 8, 18, 32, 18, 7 and its electron configuration is [Xe] 4f<sup>14</sup> 5d<sup>10</sup> 6s<sup>2</sup> 6p<sup>5</sup>. The Astatine atom has a covalent radius of 150.pm and it's Van der Waals radius is 202.pm. In its elemental form, Astatine's CAS number is 7440-68-8 and its appearance is unknown. Astatine is the rarest naturally occurring non-transuranic element. The amount of naturally occurring astatine in the world is about 25g. Astatine was discovered by Dale R. Corson, Kenneth Ross MacKenzie and Emilio Segrè in 1940.</p><p>Astatine is highly radioactive. Astatine information, including technical data, safety data, properties, research, applications and other useful facts are specified below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.<br> </p></div></div> </div> <div class="two-columns-accordion paragraph paragraph--type--two-columns-accordions paragraph--view-mode--default"> <div class="two-columns-accordion__left"> <div class="multiple-accordions paragraph paragraph--type--multiple-accordions paragraph--view-mode--default"> <h2 class="multiple-accordions__title"></h2> <div class="multiple-accordions__cta"></div> <div class="multiple-accordions__accordions"><div class="accordion-wrapper"> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--345911">General Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--345911"><div class="panel-collapse collapse" id="general-properties"><table class="table properties-table"><tbody><tr><th id="symbol">Symbol:</th><td>At</td></tr><tr><th id="atomic-number">Atomic Number:</th><td>85</td></tr><tr><th id="atomic-weight">Atomic Weight:</th><td>210</td></tr><tr><th id="element-category">Element Category:</th><td>halogen</td></tr><tr><th id="group-period-block">Group, Period, Block:</th><td>17 (halogens), 6, p</td></tr><tr><th id="color">Color:</th><td>metallic/ Presumed very dark</td></tr><tr><th id="other-names">Other Names:</th><td>Astat, Astato</td></tr></tbody></table></div></div> </div> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--345912">Physical Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--345912"><div class="panel-collapse collapse" id="physical-properties"><table class="properties-table table"><tbody><tr><th id="melting-point">Melting Point:</th><td>302 °C, 576 °F, 575 K</td></tr><tr><th id="boiling-point">Boiling Point:</th><td>337 °C, 639 °F, 610 K</td></tr><tr><th id="density">Density:</th><td>6.2–6.5 g/cm<sup>3</sup> (predicted)</td></tr><tr><th id="liquid-density">Liquid Density @ Melting Point:</th><td>N/A</td></tr><tr><th id="density-20-degrees-C">Density @ 20°C:</th><td>7 g/cm<sup>3</sup> approx.</td></tr><tr><th id="solid-density">Density of Solid:</th><td>6400 (estimated) kg·m<sup>3</sup></td></tr><tr><th id="specific-heat">Specific Heat:</th><td>N/A</td></tr><tr><th id="superconductivity-temperature">Superconductivity Temperature:</th><td>N/A</td></tr><tr><th id="triple-point">Triple Point:</th><td>N/A</td></tr><tr><th id="critical-point">Critical Point:</th><td>N/A</td></tr><tr><th id="fusion-heat">Heat of Fusion (kJ·mol<sup>-1</sup>):</th><td>23.8</td></tr><tr><th id="vaporization-heat">Heat of Vaporization (kJ·mol<sup>-1</sup>):</th><td>585.22</td></tr><tr><th id="atomization-heat">Heat of Atomization (kJ·mol<sup>-1</sup>):</th><td>91</td></tr><tr><th id="thermal-conductivity">Thermal Conductivity:</th><td>1.7 W·m<sup>-1</sup>·K<sup>-1</sup></td></tr><tr><th id="thermal-expansion">Thermal Expansion:</th><td>N/A</td></tr><tr><th id="electrical-resistivity">Electrical Resistivity:</th><td>N/A</td></tr><tr><th id="tensile-strength">Tensile Strength:</th><td>N/A</td></tr><tr><th id="molar-heat-capacity">Molar Heat Capacity:</th><td>N/A</td></tr><tr><th id="youngs-modulus">Young's Modulus:</th><td>N/A</td></tr><tr><th id="shear-modulus">Shear Modulus:</th><td>N/A</td></tr><tr><th id="bulk-modulus">Bulk Modulus:</th><td>N/A</td></tr><tr><th id="poisson-ratio">Poisson Ratio:</th><td>N/A</td></tr><tr><th id="mohs-hardness">Mohs Hardness:</th><td>N/A</td></tr><tr><th id="vickers-hardness">Vickers Hardness:</th><td>N/A</td></tr><tr><th id="brinell-hardness">Brinell Hardness:</th><td>N/A</td></tr><tr><th id="speed-of-sound">Speed of Sound:</th><td>N/A</td></tr><tr><th id="pauling-electronegativity">Pauling Electronegativity:</th><td>2.2</td></tr><tr><th id="sanderson-electronegativity">Sanderson Electronegativity:</th><td>N/A</td></tr><tr><th id="allerd-rochow-electronegativity">Allred Rochow Electronegativity:</th><td>1.9</td></tr><tr><th id="mulliken-jaffe-electronegativity">Mulliken-Jaffe Electronegativity:</th><td>2.85 (14.3% s orbital)</td></tr><tr><th id="allen-electronegativity">Allen Electronegativity:</th><td>N/A</td></tr><tr><th id="pauling-electropositivity">Pauling Electropositivity:</th><td>1.8</td></tr><tr><th id="reflectivity">Reflectivity (%):</th><td>N/A</td></tr><tr><th id="refractive-index">Refractive Index:</th><td>N/A</td></tr></tbody></table></div></div> </div> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--345913">Chemical Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--345913"><div class="panel-collapse collapse" id="chemical-properties"><table class="properties-table table"><tbody><tr><th id="electrons">Electrons:</th><td>85</td></tr><tr><th id="protons">Protons:</th><td>85</td></tr><tr><th id="neutrons">Neutrons:</th><td>125</td></tr><tr><th id="electron-configuration">Electron Configuration:</th><td>[Xe] 4f<sup>14</sup> 5d<sup>10</sup> 6s<sup>2</sup> 6p<sup>5</sup></td></tr><tr><th id="atomic-radius">Atomic Radius:</th><td>N/A</td></tr><tr><th id="atomic-radius-non-bonded">Atomic Radius,<br>non-bonded (Å):</th><td>2.02</td></tr><tr><th id="covalent-radius">Covalent Radius:</th><td>150 pm</td></tr><tr><th id="covalent-radius-non-bonded">Covalent Radius (Å):</th><td>1.48</td></tr><tr><th id="van-der-waals-radius">Van der Waals Radius:</th><td>202 pm</td></tr><tr><th id="oxidation-states">Oxidation States:</th><td>7, 5, 3, 1, -1</td></tr><tr><th id="phase">Phase:</th><td>Solid</td></tr><tr><th id="crystal-structure">Crystal Structure:</th><td>N/A</td></tr><tr><th id="magnetic-ordering">Magnetic Ordering:</th><td>N/A</td></tr><tr><th id="electron-affinity">Electron Affinity (kJ·mol<sup>-1</sup>)</th><td>270.159</td></tr><tr><th id="1-ionization">1<sup>st</sup> Ionization Energy:</th><td>887.7±38.59 kJ·mol<sup>-1</sup></td></tr><tr><th id="2-ionization">2<sup>nd</sup> Ionization Energy:</th><td>N/A</td></tr><tr><th id="3-ionization">3<sup>rd</sup> Ionization Energy:</th><td>N/A</td></tr></tbody></table></div></div> </div> <div class="ae-accordion-open-close-all-btns"> <button class="ae-accordion-open-close-all-btns__open">+ OPEN ALL</button> <button class="ae-accordion-open-close-all-btns__close">- CLOSE ALL</button> </div> </div></div> </div> </div> <div class="two-columns-accordion__right"> <div class="multiple-accordions paragraph paragraph--type--multiple-accordions paragraph--view-mode--default"> <h2 class="multiple-accordions__title"></h2> <div class="multiple-accordions__cta"></div> <div class="multiple-accordions__accordions"><div class="accordion-wrapper"> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--346909">Identifiers</h4> <div class="custom-accordion-body accordion-default-close accordion--346909"><div class="panel-collapse collapse" id="identifiers"><table class="table properties-table"><tbody><tr><th id="cas-number">CAS Number:</th><td>7440-68-8</td></tr><tr><th id="ec-number">EC Number:</th><td>N/A</td></tr><tr><th id="mdl-number">MDL Number:</th><td>N/A</td></tr><tr><th id="beilstein-number">Beilstein Number:</th><td>N/A</td></tr><tr><th id="smile-id">SMILES Identifier:</th><td>[At]</td></tr><tr><th id="inchi-id">InChI Identifier:</th><td>InChI=1S/At</td></tr><tr><th id="inchi-key">InChI Key:</th><td>RYXHOMYVWAEKHL-UHFFFAOYSA-N</td></tr><tr><th id="pubchem-cid">PubChem CID:</th><td>5460479</td></tr><tr><th id="chemspider-id">ChemSpider ID:</th><td>4573995</td></tr></tbody></table></div></div> </div> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--346910">Abundance</h4> <div class="custom-accordion-body accordion-default-close accordion--346910"><div class="panel-collapse collapse" id="abundance"><table class="table properties-table"><tbody><tr><th class="abundance" id="earth-total">Earth - Total:</th><td>N/A</td></tr><tr><th class="abundance" id="mercury-total">Mercury - Total:</th><td>N/A</td></tr><tr><th class="abundance" id="venus-total">Venus - Total:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-earth-seawater-weight">Earth - Seawater (Oceans), ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-earth-seawater-atoms">Earth - Seawater (Oceans), ppb by atoms:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-earth-crust-weight">Earth -  Crust (Crustal Rocks), ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-earth-crust-atoms">Earth -  Crust (Crustal Rocks), ppb by atoms:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-sun-weight">Sun - Total, ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-sun-atoms">Sun - Total, ppb by atoms:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-stream-weight">Stream, ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-stream-atoms">Stream, ppb by atoms:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-meterorite-carbonaceous-weight">Meterorite (Carbonaceous), ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-meterorite-carbonaceous-atoms">Meterorite (Carbonaceous), ppb by atoms:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-human-body-weight">Typical Human Body, ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-human-body-atoms">Typical Human Body, ppb by atom:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-universe-weight">Universe, ppb by weight:</th><td>N/A</td></tr><tr><th class="abundance" id="abundance-universe-atoms">Universe, ppb by atom:</th><td>N/A</td></tr></tbody></table></div></div> </div> <div class="ae-custom-accordion paragraph paragraph--type--accordion paragraph--view-mode--default"> <h4 class="custom-accordion-header accordion--346911">History</h4> <div class="custom-accordion-body accordion-default-close accordion--346911"><div class="panel-collapse collapse" id="history"><table class="table properties-table"><tbody><tr><th id="discovered">Discovered By:</th><td>Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè</td></tr><tr><th id="discovery-date">Discovery Date:</th><td>1940</td></tr><tr><th id="first-isolation">First Isolation:</th><td>N/A</td></tr></tbody></table></div></div> </div> <div class="ae-accordion-open-close-all-btns"> <button class="ae-accordion-open-close-all-btns__open">+ OPEN ALL</button> <button class="ae-accordion-open-close-all-btns__close">- CLOSE ALL</button> </div> </div></div> </div> </div> </div> </div> <div id="tab-isotopes" class="tab-body paragraph paragraph--type--isotopes paragraph--view-mode--default"> <div class="paragraph text-with-title paragraph--type--text-with-title paragraph--view-mode--default"> <h2 class="text-with-title__title">Astatine Isotopes </h2> <div class="text-with-title__body"><div class="tab-pane active" id="isotopes" role="tabpanel" aria-labelledby="tab3"><p>Astatine (At) has no stable isotopes. The 37 known isotopes of astatine, ranging from <sup>191</sup>At to <sup>223</sup>At, are radioactive.</p><table class="isotopes-table"><thead><tr><th scope="col" id="nuclide"><strong>Nuclide</strong></th><th scope="col" id="mass"><strong>Isotopic Mass</strong></th><th scope="col" id="half-life"><strong>Half-Life</strong></th><th scope="col" id="decay"><strong>Mode of Decay</strong></th><th scope="col" id="nuclear-spin"><strong>Nuclear Spin</strong></th><th scope="col" id="magnetic-moment"><strong>Magnetic Moment</strong></th><th scope="col" id="binding-energy"><strong>Binding Energy (MeV)</strong></th><th scope="col" id="natural-abundance"><strong>Natural Abundance</strong><br><strong>(% by atom)</strong></th></tr></thead><tbody><tr><th scope="row"><strong><sup>191</sup>At</strong></th><td>191</td><td>1.7(+11-5) ms</td><td>Unknown</td><td>(1/2+)</td><td>N/A</td><td>N/A</td><td>-</td></tr><tr><th scope="row"><strong><sup>193</sup>At</strong></th><td>192.99984(6)</td><td>28(+5-4) ms</td><td>a to <sup>189</sup>Bi</td><td>(1/2+)</td><td>N/A</td><td>1473.13</td><td>-</td></tr><tr><th scope="row"><strong><sup>194</sup>At</strong></th><td>193.99873(20)</td><td>~40 ms</td><td>a to <sup>190</sup>Bi; ß<sup>+</sup> to <sup>194</sup>Po</td><td>3+#</td><td>N/A</td><td>1481.21</td><td>-</td></tr><tr><th scope="row"><strong><sup>195</sup>At</strong></th><td>194.996268(10)</td><td>328(20) ms</td><td>a to <sup>191</sup>Bi; ß<sup>+</sup> to <sup>195</sup>Po</td><td>(1/2+)</td><td>N/A</td><td>1489.29</td><td>-</td></tr><tr><th scope="row"><strong><sup>196</sup>At</strong></th><td>195.99579(6)</td><td>253(9) ms</td><td>a to <sup>192</sup>Bi; ß<sup>+</sup> to <sup>196</sup>Po</td><td>3+#</td><td>N/A</td><td>1497.37</td><td>-</td></tr><tr><th scope="row"><strong><sup>197</sup>At</strong></th><td>196.99319(5)</td><td>0.390(16) s</td><td>a to <sup>193</sup>Bi; ß<sup>+</sup> to <sup>197</sup>Po</td><td>(9/2-)</td><td>N/A</td><td>1505.45</td><td>-</td></tr><tr><th scope="row"><strong><sup>198</sup>At</strong></th><td>197.99284(5)</td><td>4.2(3) s</td><td>a to <sup>194</sup>Bi; ß<sup>+</sup> to <sup>198</sup>Po</td><td>(3+)</td><td>N/A</td><td>1513.53</td><td>-</td></tr><tr><th scope="row"><strong><sup>199</sup>At</strong></th><td>198.99053(5)</td><td>6.92(13) s</td><td>a to <sup>195</sup>Bi; ß<sup>+</sup> to <sup>199</sup>Po</td><td>(9/2-)</td><td>N/A</td><td>1521.6</td><td>-</td></tr><tr><th scope="row"><strong><sup>200</sup>At</strong></th><td>199.990351(26)</td><td>43.2(9) s</td><td>a to <sup>196</sup>Bi; ß<sup>+</sup> to <sup>200</sup>Po</td><td>(3+)</td><td>N/A</td><td>1529.68</td><td>-</td></tr><tr><th scope="row"><strong><sup>201</sup>At</strong></th><td>200.988417(9)</td><td>85(3) s</td><td>a to <sup>197</sup>Bi; ß<sup>+</sup> to <sup>201</sup>Po</td><td>(9/2-)</td><td>N/A</td><td>1547.08</td><td>-</td></tr><tr><th scope="row"><strong><sup>202</sup>At</strong></th><td>201.98863(3)</td><td>184(1) s</td><td>ß<sup>+</sup> to <sup>202</sup>Po; a to <sup>198</sup>Bi</td><td>(2,3)+</td><td>N/A</td><td>1555.16</td><td>-</td></tr><tr><th scope="row"><strong><sup>203</sup>At</strong></th><td>202.986942(13)</td><td>7.37(13) min</td><td>ß<sup>+</sup> to <sup>203</sup>Po; a to <sup>199</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1563.23</td><td>-</td></tr><tr><th scope="row"><strong><sup>204</sup>At</strong></th><td>203.987251(26)</td><td>9.2(2) min</td><td>ß<sup>+</sup> to <sup>204</sup>Po; a to <sup>200</sup>Bi</td><td>7+</td><td>N/A</td><td>1571.31</td><td>-</td></tr><tr><th scope="row"><strong><sup>205</sup>At</strong></th><td>204.986074(16)</td><td>26.2(5) min</td><td>ß<sup>+</sup> to <sup>205</sup>Po; a to <sup>201</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1579.39</td><td>-</td></tr><tr><th scope="row"><strong><sup>206</sup>At</strong></th><td>205.986667(22)</td><td>30.6(13) min</td><td>ß<sup>+</sup> to <sup>206</sup>Po; a to <sup>202</sup>Bi</td><td>(5)+</td><td>N/A</td><td>1587.47</td><td>-</td></tr><tr><th scope="row"><strong><sup>207</sup>At</strong></th><td>206.985784(23)</td><td>1.80(4) h</td><td>EC to <sup>207</sup>Po; a to <sup>203</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1595.55</td><td>-</td></tr><tr><th scope="row"><strong><sup>208</sup>At</strong></th><td>207.986590(28)</td><td>1.63(3) h</td><td>EC to <sup>208</sup>Po; a to <sup>204</sup>Bi</td><td>6+</td><td>N/A</td><td>1603.63</td><td>-</td></tr><tr><th scope="row"><strong><sup>209</sup>At</strong></th><td>208.986173(8)</td><td>5.41(5) h</td><td>EC to <sup>209</sup>Po; a to <sup>205</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1611.71</td><td>-</td></tr><tr><th scope="row"><strong><sup>210</sup>At</strong></th><td>209.987148(8)</td><td>8.1(4) h</td><td>EC to <sup>210</sup>Po; a to <sup>206</sup>Bi</td><td>(5)+</td><td>N/A</td><td>1619.79</td><td>-</td></tr><tr><th scope="row"><strong><sup>211</sup>At</strong></th><td>210.9874963(30)</td><td>7.214(7) h</td><td>EC to <sup>211</sup>Po; a to <sup>207</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1627.86</td><td>-</td></tr><tr><th scope="row"><strong><sup>212</sup>At</strong></th><td>211.990745(8)</td><td>0.314(2) s</td><td>a to <sup>208</sup>Bi; ß<sup>+</sup> to <sup>212</sup>Po; ß<sup>-</sup> to <sup>212</sup>Rn</td><td>(1-)</td><td>N/A</td><td>1626.63</td><td>-</td></tr><tr><th scope="row"><strong><sup>213</sup>At</strong></th><td>212.992937(5)</td><td>125(6) ns</td><td>a to <sup>209</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1634.71</td><td>-</td></tr><tr><th scope="row"><strong><sup>214</sup>At</strong></th><td>213.996372(5)</td><td>558(10) ns</td><td>a to <sup>210</sup>Bi</td><td>1-</td><td>N/A</td><td>1642.78</td><td>-</td></tr><tr><th scope="row"><strong><sup>215</sup>At</strong></th><td>214.998653(7)</td><td>0.10(2) ms</td><td>a to <sup>211</sup>Bi</td><td>9/2-</td><td>N/A</td><td>1650.86</td><td>-</td></tr><tr><th scope="row"><strong><sup>216</sup>At</strong></th><td>216.002423(4)</td><td>0.30(3) ms</td><td>a to <sup>212</sup>Bi; ß<sup>-</sup> to <sup>216</sup>Rn; EC to <sup>216</sup>Po</td><td>1-</td><td>N/A</td><td>1649.63</td><td>-</td></tr><tr><th scope="row"><strong><sup>217</sup>At</strong></th><td>217.004719(5)</td><td>32.3(4) ms</td><td>a to <sup>213</sup>Bi; ß<sup>-</sup> to <sup>217</sup>Rn</td><td>9/2-</td><td>N/A</td><td>1657.7</td><td>-</td></tr><tr><th scope="row"><strong><sup>218</sup>At</strong></th><td>218.008694(12)</td><td>1.5(3) s</td><td>a to <sup>214</sup>Bi; ß<sup>-</sup> to <sup>218</sup>Rn</td><td>1-#</td><td>N/A</td><td>1665.78</td><td>-</td></tr><tr><th scope="row"><strong><sup>219</sup>At</strong></th><td>219.011162(4)</td><td>56(3) s</td><td>a to <sup>215</sup>Bi; ß<sup>-</sup> to <sup>219</sup>Rn</td><td>5/2-#</td><td>N/A</td><td>1664.55</td><td>-</td></tr><tr><th scope="row"><strong><sup>220</sup>At</strong></th><td>220.01541(6)</td><td>3.71(4) min</td><td>ß<sup>-</sup> to <sup>220</sup>Rn; a to <sup>216</sup>Bi</td><td>3(-#)</td><td>N/A</td><td>1672.62</td><td>-</td></tr><tr><th scope="row"><strong><sup>221</sup>At</strong></th><td>221.01805(21)#</td><td>2.3(2) min</td><td>ß<sup>-</sup> to <sup>221</sup>Rn</td><td>3/2-#</td><td>N/A</td><td>1680.7</td><td>-</td></tr><tr><th scope="row"><strong><sup>222</sup>At</strong></th><td>222.02233(32)#</td><td>54(10) s</td><td>ß<sup>-</sup> to <sup>222</sup>Rn</td><td>N/A</td><td>N/A</td><td>1679.46</td><td>-</td></tr><tr><th scope="row"><strong><sup>223</sup>At</strong></th><td>223.02519(43)#</td><td>50(7) s</td><td>Unknown</td><td>3/2-#</td><td>N/A</td><td>1687.54</td><td>-</td></tr></tbody></table></div></div> </div> </div> </div> </div> </div> </article> </div> </div> </section> </main> </div> </div> <footer class="site-footer"> <div class="layout-container"> <div class="site-footer__top clearfix"> <div> <div id="block-sponsers-box2" class="Sponsers-box-block"> <div> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div> <div class="visually-hidden">Image</div> <img loading="lazy" src="/images/styles/large/public/2025-01/ARPA-E-Summit.png?itok=E3UTxRam" width="480" height="104" alt="ARPA-E Energy Innovation Summit" title="ARPA-E Energy Innovation Summit" /> </div> </div> </div> </div> <p>Please join us and our customers and co-sponsors GE and BASF at the <a href="https://www.arpae-summit.com/">ARPA-E Energy Innovation Summit</a> in Washington, DC on March 17, 2025.</p> </div> <div id="block-ae-theme-copyright" class="footer-copyright"> <div class="footer-copyright--text"> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div> Periodic table of the elements, materials science and academic information, elements and advanced materials data, scientific presentations and all pages, designs, concepts, logos, and color schemes herein are the copyrighted proprietary rights and intellectual property of American Elements. 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