Curium | AMERICAN ELEMENTS®

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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="358339" class="elements"> <div class="element-main"> <div class="elements__banner "> <img src=/images/2024-08/curium-banner.jpg /> </div> <h1 class="elements__banner__title"> <span>Curium</span> </h1> <div class="elements__banner__properties"> <div class="elements__banner__properties--number">96</div> <div class="elements__banner__properties--symbol">Cm</div> <div class="elements__banner__properties--mass">247.00</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-04ae21797935bb5b704c0f29148246ff8cecf3f2ee4c51e50b72f35471e41d85"> <div class="all-items"> <div>Curium</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 Curium</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/curium-bohr-model.jpg" alt="Curium Bohr" width="200" height="200"><p>Curium, a radioactive transuranic chemical element, was first synthesized in 1944 by Glenn T. Seaborg, Ralph A. James, and Albert Ghiorso at the University of California at <a href="https://www.americanelements.com/http%3A//www.berkeley.edu">Berkeley</a>. The work was related to the Manhattan Project, so the discovery was kept classified until the end of World War II. The announcement was planned at an <a href="https://www.americanelements.com/http%3A//www.acs.org/content/acs/en.html">American Chemical Society</a> meeting, but Seaborg let the news slip a few days early on a kids’ radio show when a precocious young guest asked if he had discovered any new transuranic elements lately. The name was selected in honor of Marie Sklodowska-Curie and Pierre Curie and their pioneering research in radioactivity.</p><p>Curium is used as a fuel in radioisotope thermoelectric generators (RTGs), and as an alpha particle source in alpha particle X-ray spectrometers (APXS). AXPS instruments are primarily used in <a href="https://www.americanelements.com/space-industry.html">space exploration</a> missions, and have been included in a number of Mars rovers. Curium is also used in the production of higher transuranic and transactinide elements.</p><p>Curium does not occur naturally on Earth and is typically produced by bombarding <a href="https://www.americanelements.com/uu.htm">uranium</a> or <a href="https://www.americanelements.com/pu.html">plutonium</a> with neutrons in nuclear reactors. The pure element is hard, brittle, malleable, and appears a lustrous silvery white.</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">Curium 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/curium-bohr.jpg" alt="Curium Bohr Model" width="200" height="200"><strong>Curium</strong> is a Block P, Group 3, Period 7 element. The number of electrons in each of curium's shells is 2, 8, 18, 32, 25, 9, 2 and its electron configuration is [Rn] 5f<sup>7</sup> 6d<sup>1</sup> 7s<sup>2</sup>. The curium atom has a radius of 174pm. In its elemental form, curium's CAS number is 7440-51-9. Curium is radioactive. It is produced by bombarding uranium or plutonium with neutrons in nuclear reactors. Curium is found in spent nuclear fuel and small amounts are produced for research. Curium was discovered by Glenn T. Seaborg, Ralph A. James and Albert Ghiorso at the <a href="http://www.berkeley.edu/index.html" target="new" rel="nofollow">University of California, Berkeley</a> in 1944. The element was named in honor of Marie and Pierre Curie.</p><p>Curium information, including technical data, properties, and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.</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--346107">General Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--346107"><div class="panel-collapse collapse" id="general-properties"><table class="table properties-table"><tbody><tr><th id="symbol">Symbol:</th><td>Cm</td></tr><tr><th id="atomic-number">Atomic Number:</th><td>96</td></tr><tr><th id="atomic-weight">Atomic Weight:</th><td>247</td></tr><tr><th id="element-category">Element Category:</th><td>Actinide</td></tr><tr><th id="group-period-block">Group, Period, Block:</th><td>n/a, 7, f</td></tr><tr><th id="color">Color:</th><td>silvery-white</td></tr><tr><th id="other-names">Other Names:</th><td>Curio</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--346108">Physical Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--346108"><div class="panel-collapse collapse" id="physical-properties"><table class="properties-table table"><tbody><tr><th id="melting-point">Melting Point:</th><td>1345 °C, 2453 °F, 1618 K</td></tr><tr><th id="boiling-point">Boiling Point:</th><td>3110 °C, 5630 °F, 3383 K</td></tr><tr><th id="density">Density:</th><td>13300 kg·m<sup>3</sup></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>13.5 g/cm<sup>3</sup></td></tr><tr><th id="solid-density">Density of Solid:</th><td>13510 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>15</td></tr><tr><th id="vaporization-heat">Heat of Vaporization (kJ·mol<sup>-1</sup>):</th><td>about 32</td></tr><tr><th id="atomization-heat">Heat of Atomization (kJ·mol<sup>-1</sup>):</th><td>382</td></tr><tr><th id="thermal-conductivity">Thermal Conductivity:</th><td>N/A</td></tr><tr><th id="thermal-expansion">Thermal Expansion:</th><td>N/A</td></tr><tr><th id="electrical-resistivity">Electrical Resistivity:</th><td>1.25 µΩ·m</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>1.3</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>1.2</td></tr><tr><th id="mulliken-jaffe-electronegativity">Mulliken-Jaffe Electronegativity:</th><td>N/A</td></tr><tr><th id="allen-electronegativity">Allen Electronegativity:</th><td>N/A</td></tr><tr><th id="pauling-electropositivity">Pauling Electropositivity:</th><td>2.7</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--346109">Chemical Properties</h4> <div class="custom-accordion-body accordion-default-close accordion--346109"><div class="panel-collapse collapse" id="chemical-properties"><table class="properties-table table"><tbody><tr><th id="electrons">Electrons:</th><td>96</td></tr><tr><th id="protons">Protons:</th><td>96</td></tr><tr><th id="neutrons">Neutrons:</th><td>151</td></tr><tr><th id="electron-configuration">Electron Configuration:</th><td>[Rn] 5f<sup>7</sup> 6d<sup>1</sup> 7s<sup>2</sup></td></tr><tr><th id="atomic-radius">Atomic Radius:</th><td>174 pm</td></tr><tr><th id="atomic-radius-non-bonded">Atomic Radius,<br>non-bonded (Å):</th><td>2.45</td></tr><tr><th id="covalent-radius">Covalent Radius:</th><td>169±3 pm</td></tr><tr><th id="covalent-radius-non-bonded">Covalent Radius (Å):</th><td>1.68</td></tr><tr><th id="van-der-waals-radius">Van der Waals Radius:</th><td>N/A</td></tr><tr><th id="oxidation-states">Oxidation States:</th><td>4, 3 (amphoteric oxide)</td></tr><tr><th id="phase">Phase:</th><td>Solid</td></tr><tr><th id="crystal-structure">Crystal Structure:</th><td>hexagonal close-packed</td></tr><tr><th id="magnetic-ordering">Magnetic Ordering:</th><td>antiferromagnetic (paramagnetic transition at 52 K)</td></tr><tr><th id="electron-affinity">Electron Affinity (kJ·mol<sup>-1</sup>)</th><td>Unknown</td></tr><tr><th id="1-ionization">1<sup>st</sup> Ionization Energy:</th><td>581 kJ·mol<sup>-1</sup> (estimated)</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--346857">Identifiers</h4> <div class="custom-accordion-body accordion-default-close accordion--346857"><div class="panel-collapse collapse" id="identifiers"><table class="table properties-table"><tbody><tr><th id="cas-number">CAS Number:</th><td>7440-51-9</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>[Cm]</td></tr><tr><th id="inchi-id">InChI Identifier:</th><td>InChI=1S/Cm</td></tr><tr><th id="inchi-key">InChI Key:</th><td>NIWWFAAXEMMFMS-UHFFFAOYSA-N</td></tr><tr><th id="pubchem-cid">PubChem CID:</th><td>23979</td></tr><tr><th id="chemspider-id">ChemSpider ID:</th><td>22415</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--346858">Abundance</h4> <div class="custom-accordion-body accordion-default-close accordion--346858"><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--346859">History</h4> <div class="custom-accordion-body accordion-default-close accordion--346859"><div class="panel-collapse collapse" id="history"><table class="table properties-table"><tbody><tr><th id="discovered">Discovered By:</th><td>Glenn Seaborg, Ralph James, Albert Ghiorso</td></tr><tr><th id="discovery-date">Discovery Date:</th><td>1944</td></tr><tr><th id="first-isolation">First Isolation:</th><td>Carl Gustaf Mosander (1842)</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">Curium Isotopes</h2> <div class="text-with-title__body"><div class="tab-pane active" id="isotopes" role="tabpanel" aria-labelledby="tab3"><p>Curium is an artificial element. It has no stable isotopes.</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>232</sup>Cm</strong></th><td>232</td><td>1? min</td><td>N/A</td><td>0+</td><td>N/A</td><td>N/A</td><td>-</td></tr><tr><th scope="row"><strong><sup>233</sup>Cm</strong></th><td>233.05077(8)</td><td>1# min</td><td>ß<sup>+</sup> to <sup>233</sup>Am; a to <sup>229</sup>Pu</td><td>3/2+#</td><td>N/A</td><td>1758.192017</td><td>-</td></tr><tr><th scope="row"><strong><sup>234</sup>Cm</strong></th><td>234.05016(2)</td><td>51(12) s</td><td>ß<sup>+</sup> to <sup>234</sup>Am; a to <sup>230</sup>Pu</td><td>0+</td><td>N/A</td><td>1766.785034</td><td>-</td></tr><tr><th scope="row"><strong><sup>235</sup>Cm</strong></th><td>235.05143(22)#</td><td>5# min</td><td>ß<sup>+</sup> to <sup>235</sup>Am; a to <sup>231</sup>Pu</td><td>5/2+#</td><td>N/A</td><td>1773.598022</td><td>-</td></tr><tr><th scope="row"><strong><sup>236</sup>Cm</strong></th><td>236.05141(22)#</td><td>10# min</td><td>ß<sup>+</sup> to <sup>236</sup>Am; a to <sup>232</sup>Pu</td><td>0+</td><td>N/A</td><td>1781.843018</td><td>-</td></tr><tr><th scope="row"><strong><sup>237</sup>Cm</strong></th><td>237.05290(22)#</td><td>20# min</td><td>ß<sup>+</sup> to <sup>237</sup>Am; a to <sup>233</sup>Pu</td><td>5/2+#</td><td>N/A</td><td>1788.530029</td><td>-</td></tr><tr><th scope="row"><strong><sup>238</sup>Cm</strong></th><td>238.05303(4)</td><td>2.4(1) h</td><td>EC to <sup>238</sup>Am; a to <sup>234</sup>Pu</td><td>0+</td><td>N/A</td><td>1796.484497</td><td>-</td></tr><tr><th scope="row"><strong><sup>239</sup>Cm</strong></th><td>239.05496(11)#</td><td>~2.9 h</td><td>ß<sup>+</sup> to <sup>239</sup>Am; a to <sup>235</sup>Pu</td><td>(7/2-)</td><td>N/A</td><td>1802.754028</td><td>-</td></tr><tr><th scope="row"><strong><sup>240</sup>Cm</strong></th><td>240.0555295(25)</td><td>27(1) d</td><td>a to <sup>236</sup>Pu; EC to <sup>240</sup>Am; SF</td><td>0+</td><td>N/A</td><td>1810.295898</td><td>-</td></tr><tr><th scope="row"><strong><sup>241</sup>Cm</strong></th><td>241.0576530(23)</td><td>32.8(2) d</td><td>a to <sup>237</sup>Pu; EC to <sup>241</sup>Am</td><td>1/2+</td><td>N/A</td><td>1816.385254</td><td>-</td></tr><tr><th scope="row"><strong><sup>242</sup>Cm</strong></th><td>242.0588358(20)</td><td>162.8(2) d</td><td>a to <sup>238</sup>Pu; SF</td><td>0+</td><td>N/A</td><td>1823.35498</td><td>-</td></tr><tr><th scope="row"><strong><sup>243</sup>Cm</strong></th><td>243.0613891(22)</td><td>29.1(1) y</td><td>a to <sup>239</sup>Pu; EC to <sup>243</sup>Am</td><td>5/2+</td><td>0.41</td><td>1829.04834</td><td>-</td></tr><tr><th scope="row"><strong><sup>244</sup>Cm</strong></th><td>244.0627526(20)</td><td>18.10(2) y</td><td>a to <sup>240</sup>Pu; SF</td><td>0+</td><td>N/A</td><td>1835.848999</td><td>-</td></tr><tr><th scope="row"><strong><sup>245</sup>Cm</strong></th><td>245.0654912(22)</td><td>8.5(1)×10<sup>3</sup> y</td><td>a to <sup>241</sup>Pu; SF</td><td>7/2+</td><td>0.5</td><td>1841.368774</td><td>-</td></tr><tr><th scope="row"><strong><sup>246</sup>Cm</strong></th><td>246.0672237(22)</td><td>4.76(4)×10<sup>3</sup> y</td><td>a to <sup>242</sup>Pu; SF</td><td>0+</td><td>N/A</td><td>1847.826782</td><td>-</td></tr><tr><th scope="row"><strong><sup>247</sup>Cm</strong></th><td>247.070354(5)</td><td>1.56(5)×10<sup>7</sup> y</td><td>a to <sup>243</sup>Pu</td><td>9/2-</td><td>0.37</td><td>1852.983154</td><td>-</td></tr><tr><th scope="row"><strong><sup>248</sup>Cm</strong></th><td>248.072349(5)</td><td>3.48(6)×10<sup>5</sup> y</td><td>a to <sup>244</sup>Pu; SF</td><td>0+</td><td>N/A</td><td>1859.195801</td><td>-</td></tr><tr><th scope="row"><strong><sup>249</sup>Cm</strong></th><td>249.075953(5)</td><td>64.15(3) min</td><td>ß<sup>-</sup> to <sup>249</sup>Bk</td><td>1/2(+)</td><td>N/A</td><td>1863.90918</td><td>-</td></tr><tr><th scope="row"><strong><sup>250</sup>Cm</strong></th><td>250.078357(12)</td><td>8300# y</td><td>a to <sup>246</sup>Pu; ß<sup>-</sup> to <sup>250</sup>Bk; SF</td><td>0+</td><td>N/A</td><td>1869.741577</td><td>-</td></tr><tr><th scope="row"><strong><sup>251</sup>Cm</strong></th><td>251.082285(24)</td><td>16.8(2) min</td><td>ß<sup>-</sup> to <sup>251</sup>Bk</td><td>(1/2+)</td><td>N/A</td><td>1874.154785</td><td>-</td></tr><tr><th scope="row"><strong><sup>252</sup>Cm</strong></th><td>252.08487(32)#</td><td><1 d</td><td>ß<sup>-</sup> to <sup>252</sup>Bk</td><td>0+</td><td>N/A</td><td>1879.812012</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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