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Radon (Rn) | AMERICAN ELEMENTS ®
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Follow Us <div id="social"> <a class="ming-link social twitter" href="https://translate.google.com/website?sl=en&tl=it&hl=en&u=https://www.twitter.com/AmericanElement"><span class="sr-only">Twitter</span></a> <a class="ming-link social facebook" href="https://translate.google.com/website?sl=en&tl=it&hl=en&u=https://www.facebook.com/AmericanElement"><span class="sr-only">Facebook</span></a> <a class="ming-link social linkedin" href="https://translate.google.com/website?sl=en&tl=it&hl=en&u=https://www.linkedin.com/company/american-elements"><span class="sr-only">LinkedIn</span></a> <a class="ming-link social instagram" href="https://translate.google.com/website?sl=en&tl=it&hl=en&u=https://www.instagram.com/americanelements/"><span class="sr-only">Instagram</span></a> </div> </div> </div> </div> </div> <div class="container-fluid" id="main-content"> <div id="page-content"><!--End Nicemenu --> <!--ZOOMRESTART--> <div class="banner"><!-- InstanceBeginEditable name="page-title" --> <h1 class="short">Radon</h1><!--ZOOMSTOP--><span class="element-item2 radioactive nonmetal" aria-hidden="true"><span class="symbol2">Rn</span><span class="number">86</span><span class="weight">222</span></span><!--ZOOMRESTART--> <!-- InstanceEndEditable --> </div><!-- InstanceBeginEditable name="page-content" --> <!-- Nav tabs --> <div id="element-tabs"> <ul class="nav nav-pills nav-justified" role="tablist"> <li class="active"><a href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#about" id="tab1" role="tab" aria-controls="about" data-toggle="pill" class="InfoTab" tabindex="0">About Radon</a></li> <li><a href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#properties" id="tab2" role="tab" aria-controls="properties" data-toggle="pill" class="InfoTab" tabindex="0">Properties</a></li> <li><a href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#isotopes" id="tab3" role="tab" aria-controls="isotopes" data-toggle="pill" class="InfoTab" tabindex="0">Isotopes</a></li> </ul> </div><!-- Tab panes --> <div id="content"> <div class="tab-content"> <div class="tab-pane active" id="about" role="tabpanel" aria-labelledby="tab1"> <h2>About Radon</h2><img src="images_graphics/element-bohr-models/radon-bohr-model.jpg" alt="Radon Bohr" width="200" height="200" class="image-left"> <p>Radon is a radioactive noble gas that occurs naturally on earth as a decay product of <a href="https://www-americanelements-com.translate.goog/uu.htm?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en">uranium and </a><a href="https://www-americanelements-com.translate.goog/th.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en">thorium</a> deposits. The initial discovery of this element has variously been credited to Pierre and Marie Curie, who in 1899 noted that gas emitted by the previously discovered element <a href="https://www-americanelements-com.translate.goog/radium.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en">radium</a> remained active for some time, Friedrich Ernst Dorn, who noted the same phenomenon in 1900, Ernest Rutherford, who observed radioactive gas being emitted by thorium samples in 1901, and Andre-Louis Debierne, who observed radioactive gas emitted by <a href="https://www-americanelements-com.translate.goog/actinium.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en">actinium</a> in 1903. Initially the gases emitted by each separate element were given different names, but it was eventually recognized that all three were merely different isotopes of a single new element of the noble gas family.</p> <p>This new element was extensively characterised by Sir William Ramsay and Robert Whytlaw-Gray in 1910, and was later given the single element name “radon” accompanied by isotope numbers in place of the separate names for each isotope. Through the 1960’s the historical tradition of referring to the radioactive gas as an “emanation” from a given radioactive element remained in use to some degree.</p> <p>Due to its radioactivity and presence in natural deposits, radon constitutes a major health hazard, contributing to lung cancer in those exposed. Typically, exposure occurs as a result of leaks from underground, and both radon gas and small particles of its solid decay products may be inhaled, leading to radiation exposure in lung tissue. Radon’s primary application is in cancer treatment, as it can be sealed into tiny metal seeds that are implanted into tumors for continuous radiotherapy. Additionally, it is sometimes used as a radioactive tracer to check structures for gas leaks.</p> </div> <div class="tab-pane" id="properties" role="tabpanel" aria-labelledby="tab2"> <h2>Radon Properties</h2> <p><img src="radon-bohr.jpg" alt="Radon Bohr Model" width="200" height="200" class="image-left"><strong>Radon</strong> is a Block P, Group 18, Period 6 element. The number of electrons in each of Radon's shells is 2, 8, 18, 32, 18, 8 and its electronic configuration is [Xe] 4f<sup>14</sup> 5d<sup>10</sup>6s<sup>2</sup>6p<sup>6</sup>. In its elemental form radon's CAS number is 10043-92-2. The radon atom has a covalent radius of 150.pm and it's Van der Waals radius is 220.pm. Radon is produced by the radioactive decay of radium-226, which is found in phosphate, igneous and metamorphic rocks as well as uranium ores and shales. It was first isolated by William Ramsay and Robert Whytlaw-Gray in 1910. The name radon is derived from the element radium. At first radon was called niton, from the Latin word ‘Nitens’ which means shining.</p> <p>Radon is highly radioactive and a carcinogen. Radon information, including technical data, properties, 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 id="table-wrapper"> <div class="panel-group expanding" id="accordion2"> <div class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#general-properties">General Properties<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <div class="panel-collapse collapse" id="general-properties"> <table class="table properties-table"> <tbody> <tr> <th id="symbol">Symbol:</th> <td>Rn</td> </tr> <tr> <th id="atomic-number">Atomic Number:</th> <td>86</td> </tr> <tr> <th id="atomic-weight">Atomic Weight:</th> <td>222</td> </tr> <tr> <th id="element-category">Element Category:</th> <td>noble gases</td> </tr> <tr> <th id="group-period-block">Group, Period, Block:</th> <td>18, 6, p</td> </tr> <tr> <th id="color">Color:</th> <td>colorless</td> </tr> <tr> <th id="other-names">Other Names:</th> <td>Rádon</td> </tr> </tbody> </table> </div> </div> <div class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#physical-properties">Physical Properties<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <div id="physical-properties" class="panel-collapse collapse"> <table class="properties-table table"> <tbody> <tr> <th id="melting-point">Melting Point:</th> <td>-71°C, -95.8°F, 202.15 K</td> </tr> <tr> <th id="boiling-point">Boiling Point:</th> <td>-61.7°C, -79.06°F, 211.45 K</td> </tr> <tr> <th id="density">Density:</th> <td>440 (liquid 211 K) kg·m<sup>3</sup></td> </tr> <tr> <th id="liquid-density">Liquid Density @ Melting Point:</th> <td>4.4 g·cm<sup>3</sup></td> </tr> <tr> <th id="density-20-degrees-C">Density @ 20°C:</th> <td>0.00973 g/cm<sup>3</sup></td> </tr> <tr> <th id="solid-density">Density of Solid:</th> <td>4400 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>377 K, 6.28 MPa</td> </tr> <tr> <th id="fusion-heat">Heat of Fusion (kJ·mol<sup>-1</sup>):</th> <td>2.7</td> </tr> <tr> <th id="vaporization-heat">Heat of Vaporization (kJ·mol<sup>-1</sup>):</th> <td>18.1</td> </tr> <tr> <th id="atomization-heat">Heat of Atomization (kJ·mol<sup>-1</sup>):</th> <td>0</td> </tr> <tr> <th id="thermal-conductivity">Thermal Conductivity:</th> <td>3.61 m 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>5R/2 = 20.786 J·mol<sup>-1</sup>·K<sup>-1</sup></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>N/A</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>N/A</td> </tr> <tr> <th id="mulliken-jaffe-electronegativity">Mulliken-Jaffe Electronegativity:</th> <td>2.59 (12.5% 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>N/A</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 class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#chemical-properties">Chemical Properties<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <div id="chemical-properties" class="panel-collapse collapse"> <table class="properties-table table"> <tbody> <tr> <th id="electrons">Electrons:</th> <td>86</td> </tr> <tr> <th id="protons">Protons:</th> <td>86</td> </tr> <tr> <th id="neutrons">Neutrons:</th> <td>136</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>6</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>2.2</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>1.46</td> </tr> <tr> <th id="van-der-waals-radius">Van der Waals Radius:</th> <td>220 pm</td> </tr> <tr> <th id="oxidation-states">Oxidation States:</th> <td>6, 2, 0</td> </tr> <tr> <th id="phase">Phase:</th> <td>Gas</td> </tr> <tr> <th id="crystal-structure">Crystal Structure:</th> <td>face-centered cubic</td> </tr> <tr> <th id="magnetic-ordering">Magnetic Ordering:</th> <td>non-magnetic</td> </tr> <tr> <th id="electron-affinity">Electron Affinity (kJ·mol<sup>-1</sup>)</th> <td>Not stable</td> </tr> <tr> <th id="1-ionization">1<sup>st</sup> Ionization Energy:</th> <td>1037.08 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="panel-group expanding" id="accordion3"> <div class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#identifiers">Identifiers<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <div class="panel-collapse collapse" id="identifiers"> <table class="table properties-table"> <tbody> <tr> <th id="cas-number">CAS Number:</th> <td>10043-92-2</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>[Rn]</td> </tr> <tr> <th id="inchi-id">InChI Identifier:</th> <td>InChI=1S/Rn</td> </tr> <tr> <th id="inchi-key">InChI Key:</th> <td>SYUHGPGVQRZVTB-UHFFFAOYSA-N</td> </tr> <tr> <th id="pubchem-cid">PubChem CID:</th> <td>24857</td> </tr> <tr> <th id="chemspider-id">ChemSpider ID:</th> <td>23240</td> </tr> </tbody> </table> </div> </div> <div class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#abundance">Abundance<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <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 class="panel panel-default properties-panel"> <div class="panel-heading active-collapsible"><a data-toggle="collapse" class="activate-panel" href="https://www-americanelements-com.translate.goog/rn.html?_x_tr_sl=en&_x_tr_tl=it&_x_tr_hl=en#history">History<span class="Arrowhead-Down-24 dropdown-icon"></span></a> </div> <div class="panel-collapse collapse" id="history"> <table class="table properties-table"> <tbody> <tr> <th id="discovered">Discovered By:</th> <td>Friedrich Ernst Dorn</td> </tr> <tr> <th id="discovery-date">Discovery Date:</th> <td>1898</td> </tr> <tr> <th id="first-isolation">First Isolation:</th> <td>William Ramsay and Robert Whytlaw-Gray (1910)</td> </tr> </tbody> </table> </div> </div> </div> </div> </div> <div class="tab-pane" id="isotopes" role="tabpanel" aria-labelledby="tab3"> <h2>Radon Isotopes</h2> <p>Radon has 39 known isotopes. Four of them, <sup>218</sup>Rn, <sup>219</sup>Rn, <sup>220</sup>Rn and <sup>222</sup>Rn, occur in trace quantities in nature.</p> <table class="isotopes-table"> <tbody> <tr> <th scope="col" id="nuclide">Nuclide</th> <th scope="col" id="mass">Isotopic Mass</th> <th scope="col" id="half-life">Half-Life</th> <th scope="col" id="decay">Mode of Decay</th> <th scope="col" id="nuclear-spin">Nuclear Spin</th> <th scope="col" id="magnetic-moment">Magnetic Moment</th> <th scope="col" id="binding-energy">Binding Energy (MeV)</th> <th scope="col" id="natural-abundance">Natural Abundance<br> (% by atom)</th> </tr> <tr> <th scope="row"><sup>193</sup>Rn</th> <td>193</td> <td>Unknown</td> <td>Unknown</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>194</sup>Rn</th> <td>194</td> <td>Unknown</td> <td>Unknown</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>195</sup>Rn</th> <td>195.00544(5)</td> <td>6 ms</td> <td>Unknown</td> <td>3/2-#</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>196</sup>Rn</th> <td>196.002115(16)</td> <td>4.7(11) ms [4.4(+13-9) ms]</td> <td>a to <sup>192</sup>Po</td> <td>0+</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>197</sup>Rn</th> <td>197.00158(7)</td> <td>66(16) ms [65(+25-14) ms]</td> <td>a to <sup>193</sup>Po</td> <td>3/2-#</td> <td>N/A</td> <td>1521.220947</td> <td>-</td> </tr> <tr> <th scope="row"><sup>198</sup>Rn</th> <td>197.998679(14)</td> <td>65(3) ms</td> <td>a to <sup>194</sup>Po; ß<sup>+</sup> to <sup>198</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1531.975952</td> <td>-</td> </tr> <tr> <th scope="row"><sup>199</sup>Rn</th> <td>198.99837(7)</td> <td>620(30) ms</td> <td>a to <sup>195</sup>Po; ß<sup>+</sup> to <sup>199</sup>Ar</td> <td>3/2-#</td> <td>N/A</td> <td>1540.485962</td> <td>-</td> </tr> <tr> <th scope="row"><sup>200</sup>Rn</th> <td>199.995699(14)</td> <td>0.96(3) s</td> <td>a to <sup>196</sup>Po; ß<sup>+</sup> to <sup>200</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1551.009033</td> <td>-</td> </tr> <tr> <th scope="row"><sup>201</sup>Rn</th> <td>200.99563(8)</td> <td>7.0(4) s</td> <td>a to <sup>197</sup>Po; ß<sup>+</sup> to <sup>201</sup>Ar</td> <td>(3/2-)</td> <td>N/A</td> <td>1559.212036</td> <td>-</td> </tr> <tr> <th scope="row"><sup>202</sup>Rn</th> <td>201.993263(19)</td> <td>9.94(18) s</td> <td>a to <sup>198</sup>Po; ß<sup>+</sup> to <sup>202</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1569.442993</td> <td>-</td> </tr> <tr> <th scope="row"><sup>203</sup>Rn</th> <td>202.993387(25)</td> <td>44.2(16) s</td> <td>a to <sup>199</sup>Po; ß<sup>+</sup> to <sup>203</sup>Ar</td> <td>(3/2-)</td> <td>N/A</td> <td>1577.421997</td> <td>-</td> </tr> <tr> <th scope="row"><sup>204</sup>Rn</th> <td>203.991429(16)</td> <td>1.17(18) min</td> <td>a to <sup>200</sup>Po; ß<sup>+</sup> to <sup>204</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1587.311035</td> <td>-</td> </tr> <tr> <th scope="row"><sup>205</sup>Rn</th> <td>204.99172(5)</td> <td>170(4) s</td> <td>ß<sup>+</sup> to <sup>205</sup>Ar; a to <sup>201</sup>Po</td> <td>5/2-</td> <td>N/A</td> <td>1595.099976</td> <td>-</td> </tr> <tr> <th scope="row"><sup>206</sup>Rn</th> <td>205.990214(16)</td> <td>5.67(17) min</td> <td>a to <sup>202</sup>Po; ß<sup>+</sup> to <sup>206</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1604.57605</td> <td>-</td> </tr> <tr> <th scope="row"><sup>207</sup>Rn</th> <td>206.990734(28)</td> <td>9.25(17) min</td> <td>ß<sup>+</sup> to <sup>207</sup>Ar; a to <sup>203</sup>Po</td> <td>5/2-</td> <td>N/A</td> <td>1612.119385</td> <td>-</td> </tr> <tr> <th scope="row"><sup>208</sup>Rn</th> <td>207.989642(12)</td> <td>24.35(14) min</td> <td>a to <sup>204</sup>Po; ß<sup>+</sup> to <sup>208</sup>Ar</td> <td>0+</td> <td>N/A</td> <td>1628.588135</td> <td>-</td> </tr> <tr> <th scope="row"><sup>209</sup>Rn</th> <td>208.990415(21)</td> <td>28.5(10) min</td> <td>ß<sup>+</sup> to <sup>209</sup>Ar; a to <sup>205</sup>Po</td> <td>5/2-</td> <td>N/A</td> <td>1621.211182</td> <td>-</td> </tr> <tr> <th scope="row"><sup>210</sup>Rn</th> <td>209.989696(9)</td> <td>2.4(1) h</td> <td>EC to <sup>210</sup>At</td> <td>0+</td> <td>N/A</td> <td>1637.308594</td> <td>-</td> </tr> <tr> <th scope="row"><sup>211</sup>Rn</th> <td>210.990601(7)</td> <td>14.6(2) h</td> <td>EC to <sup>211</sup>At; a to <sup>207</sup>Po</td> <td>1/2-</td> <td>0.6</td> <td>1644.536377</td> <td>-</td> </tr> <tr> <th scope="row"><sup>212</sup>Rn</th> <td>211.990704(3)</td> <td>23.9(12) min</td> <td>a to <sup>208</sup>Po</td> <td>0+</td> <td>N/A</td> <td>1652.51123</td> <td>-</td> </tr> <tr> <th scope="row"><sup>213</sup>Rn</th> <td>212.993883(6)</td> <td>19.5(1) ms</td> <td>a to <sup>209</sup>Po</td> <td>(9/2+)</td> <td>N/A</td> <td>1657.620972</td> <td>-</td> </tr> <tr> <th scope="row"><sup>214</sup>Rn</th> <td>213.995363(10)</td> <td>0.27(2) µs</td> <td>a to <sup>210</sup>Po</td> <td>0+</td> <td>-0.02</td> <td>1664.315552</td> <td>-</td> </tr> <tr> <th scope="row"><sup>215</sup>Rn</th> <td>214.998745(8)</td> <td>2.30(10) µs</td> <td>a to <sup>211</sup>Po</td> <td>9/2+</td> <td>N/A</td> <td>1669.235718</td> <td>-</td> </tr> <tr> <th scope="row"><sup>216</sup>Rn</th> <td>216.000274(8)</td> <td>45(5) µs</td> <td>a to <sup>212</sup>Po</td> <td>0+</td> <td>N/A</td> <td>1675.882812</td> <td>-</td> </tr> <tr> <th scope="row"><sup>217</sup>Rn</th> <td>217.003928(5)</td> <td>0.54(5) ms</td> <td>a to <sup>213</sup>Po</td> <td>9/2+</td> <td>N/A</td> <td>1680.548218</td> <td>-</td> </tr> <tr> <th scope="row"><sup>218</sup>Rn</th> <td>218.0056013(25)</td> <td>35(5) ms</td> <td>a to <sup>214</sup>Po</td> <td>0+</td> <td>N/A</td> <td>1687.062378</td> <td>-</td> </tr> <tr> <th scope="row"><sup>219</sup>Rn</th> <td>219.0094802(27)</td> <td>3.96(1) s</td> <td>a to <sup>215</sup>Po</td> <td>5/2+</td> <td>N/A</td> <td>1691.511597</td> <td>-</td> </tr> <tr> <th scope="row"><sup>220</sup>Rn</th> <td>220.0113940(24)</td> <td>55.6(1) s</td> <td>a to <sup>216</sup>Po</td> <td>0+</td> <td>N/A</td> <td>1697.804321</td> <td>-</td> </tr> <tr> <th scope="row"><sup>221</sup>Rn</th> <td>221.015537(6)</td> <td>25.7(5) min</td> <td>a to <sup>217</sup>Po; ß<sup>-</sup> to <sup>221</sup>Fr</td> <td>7/2(+)</td> <td>N/A</td> <td>1702.083984</td> <td>-</td> </tr> <tr> <th scope="row"><sup>222</sup>Rn</th> <td>222.0175777(25)</td> <td>3.8235(3) d</td> <td>a to <sup>218</sup>Po</td> <td>0+</td> <td>N/A</td> <td>1708.184448</td> <td>-</td> </tr> <tr> <th scope="row"><sup>223</sup>Rn</th> <td>223.02179(32)#</td> <td>24.3(4) min</td> <td>a to <sup>219</sup>Po; ß<sup>-</sup> to <sup>223</sup>Fr</td> <td>7/2</td> <td>N/A</td> <td>1712.324951</td> <td>-</td> </tr> <tr> <th scope="row"><sup>224</sup>Rn</th> <td>224.02409(32)#</td> <td>107(3) min</td> <td>ß<sup>-</sup> to <sup>224</sup>Fr</td> <td>0+</td> <td>N/A</td> <td>1718.254028</td> <td>-</td> </tr> <tr> <th scope="row"><sup>225</sup>Rn</th> <td>225.02844(32)#</td> <td>4.66(4) min</td> <td>ß<sup>-</sup> to <sup>225</sup>Fr</td> <td>7/2-</td> <td>N/A</td> <td>1722.274048</td> <td>-</td> </tr> <tr> <th scope="row"><sup>226</sup>Rn</th> <td>226.03089(43)#</td> <td>7.4(1) min</td> <td>ß<sup>-</sup> to <sup>226</sup>Fr</td> <td>0+</td> <td>N/A</td> <td>1728.062988</td> <td>-</td> </tr> <tr> <th scope="row"><sup>227</sup>Rn</th> <td>227.03541(45)#</td> <td>20.8(7) s</td> <td>ß<sup>-</sup> to <sup>227</sup>Fr</td> <td>5/2(+#)</td> <td>N/A</td> <td>1731.927002</td> <td>-</td> </tr> <tr> <th scope="row"><sup>228</sup>Rn</th> <td>228.03799(44)#</td> <td>65(2) s</td> <td>ß<sup>-</sup> to <sup>228</sup>Fr</td> <td>0+</td> <td>N/A</td> <td>1737.504028</td> <td>-</td> </tr> <tr> <th scope="row"><sup>229</sup>Rn</th> <td>229.0426536(141)</td> <td>12 s</td> <td>Unknown</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>230</sup>Rn</th> <td>230</td> <td>Unknown</td> <td>Unknown</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> <tr> <th scope="row"><sup>231</sup>Rn</th> <td>231</td> <td>Unknown</td> <td>Unknown</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> <td>-</td> </tr> </tbody> </table> </div> </div><!-- InstanceEndEditable --> </div> </div> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <script src="https://www.americanelements.com/css/bootstrap/js/bootstrap.js"></script> <script src="https://www.americanelements.com/css/slippry.min.js"></script> <div class="scrollup"> ^ </div> <script> $(document).ready(function(){ $(window).scroll(function () { if ($(this).scrollTop() > 350) { $('.scrollup').fadeIn(500); 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