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<!doctype html> <html lang="en"> <head> <meta charset="utf-8">  <script async src="https://www.googletagmanager.com/gtag/js?id=UA-16744234-1"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-16744234-1'); </script>  <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="keywords" content="periodic table, periodic chart, chemistry, atomic weight, periodicity, chemical elements, chemical, webelements, web-elements, science, homework, tableau périodique, periodiek systeem, tavola periodica, Periodensystem, tabla periódica, tavola periodica" /> <meta name="Description" content="Explore the biology of the chemical elements through this periodic table" /> <meta property="fb:admins" content="146243508751503" /> <meta name="author" content="Mark Winter"> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'UA-16744234-1'); </script> <link rel="icon" type="image/png" href="favicon.png" /> <title>The periodic table of the elements by WebElements</title>  <link rel="stylesheet" type="text/css" href="_newlands/pure/pure-min.css"> <link rel="stylesheet" type="text/css" href="_newlands/pure/grids-responsive-min.css"> <link rel="stylesheet" type="text/css" href="_newlands/css/periodic-table.css"> </head> <body> <div class="header"> <div class="home-menu pure-menu pure-menu-horizontal"> <a class="pure-menu-heading" href="https://www.webelements.com/"><img class="logo30" src="_media/icons/logo_60.png" alt="WebElements Home" /> WebElements</a> <div class="google_navbar_positioning"> <form action="https://www.google.com" id="cse-search-box"> <div> <input type="hidden" name="cx" value="partner-pub-9334432533380510:6223510783" /> <input type="hidden" name="ie" value="UTF-8" /> <input type="text" name="q" size="12" /> <input type="submit" name="sa" value="Search" /> </div> </form> <script></script> </div> </div> </div> <main> <nav> <div class="pure-menu pure-menu-horizontal pure-menu-scrollable"> <ul class="pure-menu-list"> <li class="pure-menu-item pure-menu-selected"><a href="https://www.webelements.com/" class="pure-menu-link">Elements   </a></li> <li class="pure-menu-item"><a href="https://www.webelements.com/compounds.html" class="pure-menu-link">Compounds   </a></li> <li class="pure-menu-item"><a href="https://www.webelements.com/shop/" class="pure-menu-link">Shop   </a></li> <li class="pure-menu-item"><a href="https://www.webelements.com/nexus/printable-periodic-table/" class="pure-menu-link">Printable periodic table</a></li> </ul> </div> </nav> <article> <h1 class="z">The periodic table of the elements</h1> <p>The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.</p> <div class="centre"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-9334432533380510" data-ad-slot="6446849989" data-ad-format="auto"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <h2 class="z">Explore the <strong>biology</strong> of the chemical elements through this periodic table</h2> <div class="table-responsive"> <table class="pure-table periodic-table"> <thead> <tr> <th class="w8">Group</th> <th class="w5">1</th> <th class="w5">2</th> <th class="w2"> </th> <th class="w5">3</th> <th class="w5">4</th> <th class="w5">5</th> <th class="w5">6</th> <th class="w5">7</th> <th class="w5">8</th> <th class="w5">9</th> <th class="w5">10</th> <th class="w5">11</th> <th class="w5">12</th> <th class="w5">13</th> <th class="w5">14</th> <th class="w5">15</th> <th class="w5">16</th> <th class="w5">17</th> <th class="w5">18</th> </tr> </thead> <tbody> <tr> <th class="lbl">Period<br />1</th> <td class="s"> <div class="at_num">1</div> <div class="sym"><a class="sym" href="hydrogen/biology.html" title="Hydrogen">H</a></div> <div class="at_wt">1.008</div> <div class="e_name">Hydrogen</div> </td> <td class="v"></td> <td colspan="16" class="v"></td> <td class="p"> <div class="at_num">2</div> <div class="sym"><a class="sym" href="helium/biology.html" title="Helium">He</a></div> <div class="at_wt">4.0026</div> <div class="e_name">Helium</div> </td> </tr> <tr> <th class="lbl">2</th> <td class="s"> <div class="at_num">3</div> <div class="sym"><a class="sym" href="lithium/biology.html" title="Lithium">Li</a></div> <div class="at_wt">6.94</div> <div class="e_name">Lithium</div> </td> <td class="s"> <div class="at_num">4</div> <div class="sym"><a class="sym" href="beryllium/biology.html" title="Beryllium">Be</a></div> <div class="at_wt">9.0122</div> <div class="e_name">Beryllium</div> </td> <td colspan="11"></td> <td class="p"> <div class="at_num">5</div> <div class="sym"><a class="sym" href="boron/biology.html" title="|title_5">B</a></div> <div class="at_wt">10.81</div> <div class="e_name">Boron</div> </td> <td class="p"> <div class="at_num">6</div> <div class="sym"><a class="sym" href="carbon/biology.html" title="|title_6">C</a></div> <div class="at_wt">12.011</div> <div class="e_name">Carbon</div> </td> <td class="p"> <div class="at_num">7</div> <div class="sym"><a class="sym" href="nitrogen/biology.html" title="Nitrogen">N</a></div> <div class="at_wt">14.007</div> <div class="e_name">Nitrogen</div> </td> <td class="p"> <div class="at_num">8</div> <div class="sym"><a class="sym" href="oxygen/biology.html" title="Oxygen">O</a></div> <div class="at_wt">15.999</div> <div class="e_name">Oxygen</div> </td> <td class="p"> <div class="at_num">9</div> <div class="sym"><a class="sym" href="fluorine/biology.html" title="Fluorine">F</a></div> <div class="at_wt">18.998</div> <div class="e_name">Fluorine</div> </td> <td class="p"> <div class="at_num">10</div> <div class="sym"><a class="sym" href="neon/biology.html" title="Neon">Ne</a></div> <div class="at_wt">20.180</div> <div class="e_name">Neon</div> </td> </tr> <tr> <th class="lbl">3</th> <td class="s"> <div class="at_num">11</div> <div class="sym"><a class="sym" href="sodium/biology.html" title="Sodium">Na</a></div> <div class="at_wt">22.990</div> <div class="e_name">Sodium</div> </td> <td class="s"> <div class="at_num">12</div> <div class="sym"><a class="sym" href="magnesium/biology.html" title="Magnesium">Mg</a></div> <div class="at_wt">24.305</div> <div class="e_name">Magnesium</div> </td> <td colspan="11" class="void"></td> <td class="p"> <div class="at_num">13</div> <div class="sym"><a class="sym" href="aluminium/biology.html" title="Aluminium">Al</a></div> <div class="at_wt">26.982</div> <div class="e_name">Aluminium</div> </td> <td class="p"> <div class="at_num">14</div> <div class="sym"><a class="sym" href="silicon/biology.html" title="Silicon">Si</a></div> <div class="at_wt">28.085</div> <div class="e_name">Silicon</div> </td> <td class="p"> <div class="at_num">15</div> <div class="sym"><a class="sym" href="phosphorus/biology.html" title="Phosphorus">P</a></div> <div class="at_wt">30.974</div> <div class="e_name">Phosphorus</div> </td> <td class="p"> <div class="at_num">16</div> <div class="sym"><a class="sym" href="sulfur/biology.html" title="Sulfur">S</a> </div> <div class="at_wt">32.06</div> <div class="e_name">Sulfur</div> </td> <td class="p"> <div class="at_num">17</div> <div class="sym"><a class="sym" href="chlorine/biology.html" title="Chlorine">Cl</a></div> <div class="at_wt">35.45</div> <div class="e_name">Chlorine</div> </td> <td class="p"> <div class="at_num">18</div> <div class="sym"><a class="sym" href="argon/biology.html" title="Argon">Ar</a></div> <div class="at_wt">39.948</div> <div class="e_name">Argon</div> </td> </tr> <tr> <th class="lbl">4</th> <td class="s"> <div class="at_num">19</div> <div class="sym"><a class="sym" href="potassium/biology.html" title="Potassium">K</a></div> <div class="at_wt">39.098</div> <div class="e_name">Potassium</div> </td> <td class="s"> <div class="at_num">20</div> <div class="sym"><a class="sym" href="calcium/biology.html" title="Calcium">Ca</a></div> <div class="at_wt">40.078</div> <div class="e_name">Calcium</div> </td> <td class="void"></td> <td class="d"> <div class="at_num">21</div> <div class="sym"><a class="sym" href="scandium/biology.html" title="Scandium">Sc</a></div> <div class="at_wt">44.956</div> <div class="e_name">Scandium</div> </td> <td class="d"> <div class="at_num">22</div> <div class="sym"><a class="sym" href="titanium/biology.html" title="Titanium">Ti</a></div> <div class="at_wt">47.867</div> <div class="e_name">Titanium</div> </td> <td class="d"> <div class="at_num">23</div> <div class="sym"><a class="sym" href="vanadium/biology.html" title="Vanadium">V</a></div> <div class="at_wt">50.942</div> <div class="e_name">Vanadium</div> </td> <td class="d"> <div class="at_num">24</div> <div class="sym"><a class="sym" href="chromium/biology.html" title="Chromium">Cr</a></div> <div class="at_wt">51.996</div> <div class="e_name">Chromium</div> </td> <td class="d"> <div class="at_num">25</div> <div class="sym"><a class="sym" href="manganese/biology.html" title="Manganese">Mn</a></div> <div class="at_wt">54.938</div> <div class="e_name">Manganese</div> </td> <td class="d"> <div class="at_num">26</div> <div class="sym"><a class="sym" href="iron/biology.html" title="Iron">Fe</a></div> <div class="at_wt">55.845</div> <div class="e_name">Iron</div> </td> <td class="d"> <div class="at_num">27</div> <div class="sym"><a class="sym" href="cobalt/biology.html" title="Cobalt">Co</a></div> <div class="at_wt">58.933</div> <div class="e_name">Cobalt</div> </td> <td class="d"> <div class="at_num">28</div> <div class="sym"><a class="sym" href="nickel/biology.html" title="Nickel">Ni</a></div> <div class="at_wt">58.693</div> <div class="e_name">Nickel</div> </td> <td class="d"> <div class="at_num">29</div> <div class="sym"><a class="sym" href="copper/biology.html" title="Copper">Cu</a></div> <div class="at_wt">63.546</div> <div class="e_name">Copper</div> </td> <td class="d"> <div class="at_num">30</div> <div class="sym"><a class="sym" href="zinc/biology.html" title="Zinc">Zn</a></div> <div class="at_wt">65.38</div> <div class="e_name">Zinc</div> </td> <td class="p"> <div class="at_num">31</div> <div class="sym"><a class="sym" href="gallium/biology.html" title="Gallium">Ga</a></div> <div class="at_wt">69.723</div> <div class="e_name">Gallium</div> </td> <td class="p"> <div class="at_num">32</div> <div class="sym"><a class="sym" href="germanium/biology.html" title="Germanium">Ge</a></div> <div class="at_wt">72.630</div> <div class="e_name">Germanium</div> </td> <td class="p"> <div class="at_num">33</div> <div class="sym"><a class="sym" href="arsenic/biology.html" title="Arsenic">As</a></div> <div class="at_wt">74.922</div> <div class="e_name">Arsenic</div> </td> <td class="p"> <div class="at_num">34</div> <div class="sym"><a class="sym" href="selenium/biology.html" title="Selenium">Se</a></div> <div class="at_wt">78.971</div> <div class="e_name">Selenium</div> </td> <td class="p"> <div class="at_num">35</div> <div class="sym"><a class="sym" href="bromine/biology.html" title="Bromine">Br</a></div> <div class="at_wt">79.904</div> <div class="e_name">Bromine</div> </td> <td class="p"> <div class="at_num">36</div> <div class="sym"><a class="sym" href="krypton/biology.html" title="Krypton">Kr</a></div> <div class="at_wt">83.798</div> <div class="e_name">Krypton</div> </td> </tr> <tr> <th class="lbl">5</th> <td class="s"> <div class="at_num">37</div> <div class="sym"><a class="sym" href="rubidium/biology.html" title="Rubidium">Rb</a></div> <div class="at_wt">85.468</div> <div class="e_name">Rubidium</div> </td> <td class="s"> <div class="at_num">38</div> <div class="sym"><a class="sym" href="strontium/biology.html" title="Strontium">Sr</a></div> <div class="at_wt">87.62</div> <div class="e_name">Strontium</div> </td> <td class="void"></td> <td class="d"> <div class="at_num">39</div> <div class="sym"><a class="sym" href="yttrium/biology.html" title="Yttrium">Y</a></div> <div class="at_wt">88.906</div> <div class="e_name">Yttrium</div> </td> <td class="d"> <div class="at_num">40</div> <div class="sym"><a class="sym" href="zirconium/biology.html" title="Zirconium">Zr</a></div> <div class="at_wt">91.224</div> <div class="e_name">Zirconium</div> </td> <td class="d"> <div class="at_num">41</div> <div class="sym"><a class="sym" href="niobium/biology.html" title="Niobium">Nb</a></div> <div class="at_wt">92.906</div> <div class="e_name">Niobium</div> </td> <td class="d"> <div class="at_num">42</div> <div class="sym"><a class="sym" href="molybdenum/biology.html" title="Molybdenum">Mo</a></div> <div class="at_wt">95.95</div> <div class="e_name">Molybdenum</div> </td> <td class="d"> <div class="at_num">43</div> <div class="sym"><a class="sym" href="technetium/biology.html" title="Technetium">Tc</a> <small>☢</small></div> <div class="at_wt">98</div> <div class="e_name">Technetium</div> </td> <td class="d"> <div class="at_num">44</div> <div class="sym"><a class="sym" href="ruthenium/biology.html" title="Ruthenium">Ru</a></div> <div class="at_wt">101.07</div> <div class="e_name">Ruthenium</div> </td> <td class="d"> <div class="at_num">45</div> <div class="sym"><a class="sym" href="rhodium/biology.html" title="Rhodium">Rh</a></div> <div class="at_wt">102.91</div> <div class="e_name">Rhodium</div> </td> <td class="d"> <div class="at_num">46</div> <div class="sym"><a class="sym" href="palladium/biology.html" title="Palladium">Pd</a></div> <div class="at_wt">106.42</div> <div class="e_name">Palladium</div> </td> <td class="d"> <div class="at_num">47</div> <div class="sym"><a class="sym" href="silver/biology.html" title="Silver">Ag</a></div> <div class="at_wt">107.87</div> <div class="e_name">Silver</div> </td> <td class="d"> <div class="at_num">48</div> <div class="sym"><a class="sym" href="cadmium/biology.html" title="Cadmium">Cd</a></div> <div class="at_wt">112.41</div> <div class="e_name">Cadmium</div> </td> <td class="p"> <div class="at_num">49</div> <div class="sym"><a class="sym" href="indium/biology.html" title="Indium">In</a></div> <div class="at_wt">114.82</div> <div class="e_name">Indium</div> </td> <td class="p"> <div class="at_num">50</div> <div class="sym"><a class="sym" href="tin/biology.html" title="Tin">Sn</a></div> <div class="at_wt">118.71</div> <div class="e_name">Tin</div> </td> <td class="p"> <div class="at_num">51</div> <div class="sym"><a class="sym" href="antimony/biology.html" title="Antimony">Sb</a></div> <div class="at_wt">121.76</div> <div class="e_name">Antimony</div> </td> <td class="p"> <div class="at_num">52</div> <div class="sym"><a class="sym" href="tellurium/biology.html" title="Tellurium">Te</a></div> <div class="at_wt">127.60</div> <div class="e_name">Tellurium</div> </td> <td class="p"> <div class="at_num">53</div> <div class="sym"><a class="sym" href="iodine/biology.html" title="Iodine">I</a></div> <div class="at_wt">126.90</div> <div class="e_name">Iodine</div> </td> <td class="p"> <div class="at_num">54</div> <div class="sym"><a class="sym" href="xenon/biology.html" title="Xenon">Xe</a></div> <div class="at_wt">131.29</div> <div class="e_name">Xenon</div> </td> </tr> <tr> <th class="lbl">6</th> <td class="s"> <div class="at_num">55</div> <div class="sym"><a class="sym" href="caesium/biology.html" title="Caesium">Cs</a></div> <div class="at_wt">132.91</div> <div class="e_name">Caesium</div> </td> <td class="s"> <div class="at_num">56</div> <div class="sym"><a class="sym" href="barium/biology.html" title="Barium">Ba</a></div> <div class="at_wt">137.33</div> <div class="e_name">Barium</div> </td> <th class="asterisk">*</th> <td class="d"> <div class="at_num xd">71</div> <div class="sym"><a class="sym" href="lutetium/biology.html" title="Lutetium">Lu</a></div> <div class="at_wt">174.97</div> <div class="e_name">Lutetium</div> </td> <td class="d"> <div class="at_num">72</div> <div class="sym"><a class="sym" href="hafnium/biology.html" title="Hafnium">Hf</a></div> <div class="at_wt">178.49</div> <div class="e_name">Hafnium</div> </td> <td class="d"> <div class="at_num">73</div> <div class="sym"><a class="sym" href="tantalum/biology.html" title="Tantalum">Ta</a></div> <div class="at_wt">180.95</div> <div class="e_name">Tantalum</div> </td> <td class="d"> <div class="at_num">74</div> <div class="sym"><a class="sym" href="tungsten/biology.html" title="Tungsten">W</a></div> <div class="at_wt">183.84</div> <div class="e_name">Tungsten</div> </td> <td class="d"> <div class="at_num">75</div> <div class="sym"><a class="sym" href="rhenium/biology.html" title="Rhenium">Re</a></div> <div class="at_wt">186.21</div> <div class="e_name">Rhenium</div> </td> <td class="d"> <div class="at_num">76</div> <div class="sym"><a class="sym" href="osmium/biology.html" title="Osmium">Os</a></div> <div class="at_wt">190.23</div> <div class="e_name">Osmium</div> </td> <td class="d"> <div class="at_num">77</div> <div class="sym"><a class="sym" href="iridium/biology.html" title="Iridium">Ir</a></div> <div class="at_wt">192.22</div> <div class="e_name">Iridium</div> </td> <td class="d"> <div class="at_num">78</div> <div class="sym"><a class="sym" href="platinum/biology.html" title="Platinum">Pt</a></div> <div class="at_wt">195.08</div> <div class="e_name">Platinum</div> </td> <td class="d"> <div class="at_num">79</div> <div class="sym"><a class="sym" href="gold/biology.html" title="Gold">Au</a></div> <div class="at_wt">196.97</div> <div class="e_name">Gold</div> </td> <td class="d"> <div class="at_num">80</div> <div class="sym"><a class="sym" href="mercury/biology.html" title="Mercury">Hg</a></div> <div class="at_wt">200.59</div> <div class="e_name">Mercury</div> </td> <td class="p"> <div class="at_num">81</div> <div class="sym"><a class="sym" href="thallium/biology.html" title="Thallium">Tl</a></div> <div class="at_wt">204.38</div> <div class="e_name">Thallium</div> </td> <td class="p"> <div class="at_num">82</div> <div class="sym"><a class="sym" href="lead/biology.html" title="Lead">Pb</a></div> <div class="at_wt">207.2</div> <div class="e_name">Lead</div> </td> <td class="p"> <div class="at_num">83</div> <div class="sym"><a class="sym" href="bismuth/biology.html" title="Bismuth">Bi</a></div> <div class="at_wt">208.98</div> <div class="e_name">Bismuth</div> </td> <td class="p"> <div class="at_num">84</div> <div class="sym"><a class="sym" href="polonium/biology.html" title="Polonium">Po</a> <small>☢</small></div> <div class="at_wt">209</div> <div class="e_name">Polonium</div> </td> <td class="p"> <div class="at_num">85</div> <div class="sym"><a class="sym" href="astatine/biology.html" title="Astatine">At</a> <small>☢</small></div> <div class="at_wt">210</div> <div class="e_name">Astatine</div> </td> <td class="p"> <div class="at_num">86</div> <div class="sym"><a class="sym" href="radon/biology.html" title="Radon">Rn</a> <small>☢</small></div> <div class="at_wt">222</div> <div class="e_name">Radon</div> </td> </tr> <tr> <th class="lbl">7</th> <td class="s"> <div class="at_num">87</div> <div class="sym"><a class="sym" href="francium/biology.html" title="Francium">Fr</a> <small>☢</small></div> <div class="at_wt">223</div> <div class="e_name">Francium</div> </td> <td class="s"> <div class="at_num">88</div> <div class="sym"><a class="sym" href="radium/biology.html" title="Radium">Ra</a> <small>☢</small></div> <div class="at_wt">226</div> <div class="e_name">Radium</div> </td> <th class="v">**</th> <td class="d"> <div class="at_num">103</div> <div class="sym"><a class="sym" href="lawrencium/biology.html" title="Lawrencium">Lr</a> <small>☢</small></div> <div class="at_wt">262</div> <div class="e_name">Lawrencium</div> </td> <td class="d"> <div class="at_num">104</div> <div class="sym"><a class="sym" href="rutherfordium/biology.html" title="Rutherfordium">Rf</a> <small>☢</small></div> <div class="at_wt">267</div> <div class="e_name">Rutherfordium</div> </td> <td class="d"> <div class="at_num">105</div> <div class="sym"><a class="sym" href="dubnium/biology.html" title="Dubnium">Db</a> <small>☢</small></div> <div class="at_wt">270</div> <div class="e_name">Dubnium</div> </td> <td class="d"> <div class="at_num">106</div> <div class="sym"><a class="sym" href="seaborgium/biology.html" title="Seaborgium">Sg</a> <small>☢</small></div> <div class="at_wt">269</div> <div class="e_name">Seaborgium</div> </td> <td class="d"> <div class="at_num">107</div> <div class="sym"><a class="sym" href="bohrium/biology.html" title="Bohrium">Bh</a> <small>☢</small></div> <div class="at_wt">270</div> <div class="e_name">Bohrium</div> </td> <td class="d"> <div class="at_num">108</div> <div class="sym"><a class="sym" href="hassium/biology.html" title="Hassium">Hs</a> <small>☢</small></div> <div class="at_wt">269</div> <div class="e_name">Hassium</div> </td> <td class="d"> <div class="at_num">109</div> <div class="sym"><a class="sym" href="meitnerium/biology.html" title="Meitnerium">Mt</a> <small>☢</small></div> <div class="at_wt">278</div> <div class="e_name">Meitnerium</div> </td> <td class="d"> <div class="at_num">110</div> <div class="sym"><a class="sym" href="darmstadtium/biology.html" title="Darmstadtium">Ds</a> <small>☢</small></div> <div class="at_wt">281</div> <div class="e_name">Darmstadtium</div> </td> <td class="d"> <div class="at_num">111</div> <div class="sym"><a class="sym" href="roentgenium/biology.html" title="Roentgenium">Rg</a> <small>☢</small></div> <div class="at_wt">281</div> <div class="e_name">Roentgenium</div> </td> <td class="d"> <div class="at_num">112</div> <div class="sym"><a class="sym" href="copernicium/biology.html" title="Copernicium">Cn</a> <small>☢</small></div> <div class="at_wt">285</div> <div class="e_name">Copernicium</div> </td> <td class="p"> <div class="at_num">113</div> <div class="sym"><a class="sym" href="nihonium/biology.html" title="Nihonium">Nh</a> <small>☢</small></div> <div class="at_wt">286</div> <div class="e_name">Nihonium</div> </td> <td class="p"> <div class="at_num">114</div> <div class="sym"><a class="sym" href="flerovium/biology.html" title="Flerovium">Fl</a> <small>☢</small></div> <div class="at_wt">289</div> <div class="e_name">Flerovium</div> </td> <td class="p"> <div class="at_num">115</div> <div class="sym"><a class="sym" href="moscovium/biology.html" title="Moscovium">Mc</a> <small>☢</small></div> <div class="at_wt">289</div> <div class="e_name">Moscovium</div> </td> <td class="p"> <div class="at_num">116</div> <div class="sym"><a class="sym" href="livermorium/biology.html" title="Livermorium">Lv</a> <small>☢</small></div> <div class="at_wt">293</div> <div class="e_name">Livermorium</div> </td> <td class="p"> <div class="at_num">117</div> <div class="sym"><a class="sym" href="tennessine/biology.html" title="Tennessine">Ts</a> <small>☢</small></div> <div class="at_wt">293</div> <div class="e_name">Tennessine</div> </td> <td class="p"> <div class="at_num">118</div> <div class="sym"><a class="sym" href="oganesson/biology.html" title="Oganesson">Og</a> <small>☢</small></div> <div class="at_wt">294</div> <div class="e_name">Oganesson</div> </td> </tr> <tr> <td colspan="20" class="v"> </td> </tr> <tr> <th class="lbl" colspan="3">*Lanthanoids</th> <th class="v">*</th> <td class="f"> <div class="at_num">57</div> <div class="sym"><a class="sym" href="lanthanum/biology.html" title="Lanthanum">La</a></div> <div class="at_wt">138.91</div> <div class="e_name">Lanthanum</div> </td> <td class="f"> <div class="at_num">58</div> <div class="sym"><a class="sym" href="cerium/biology.html" title="Cerium">Ce</a></div> <div class="at_wt">140.12</div> <div class="e_name">Cerium</div> </td> <td class="f"> <div class="at_num">59</div> <div class="sym"><a class="sym" href="praseodymium/biology.html" title="Praseodymium">Pr</a></div> <div class="at_wt">140.91</div> <div class="e_name">Praseodymium</div> </td> <td class="f"> <div class="at_num">60</div> <div class="sym"><a class="sym" href="neodymium/biology.html" title="Neodymium">Nd</a></div> <div class="at_wt">144.24</div> <div class="e_name">Neodymium</div> </td> <td class="f"> <div class="at_num">61</div> <div class="sym"><a class="sym" href="promethium/biology.html" title="Promethium">Pm</a> <small>☢</small></div> <div class="at_wt">145</div> <div class="e_name">Promethium</div> </td> <td class="f"> <div class="at_num">62</div> <div class="sym"><a class="sym" href="samarium/biology.html" title="Samarium">Sm</a></div> <div class="at_wt">150.36</div> <div class="e_name">Samarium</div> </td> <td class="f"> <div class="at_num">63</div> <div class="sym"><a class="sym" href="europium/biology.html" title="Europium">Eu</a></div> <div class="at_wt">151.96</div> <div class="e_name">Europium</div> </td> <td class="f"> <div class="at_num">64</div> <div class="sym"><a class="sym" href="gadolinium/biology.html" title="Gadolinium">Gd</a></div> <div class="at_wt">157.25</div> <div class="e_name">Gadolinium</div> </td> <td class="f"> <div class="at_num">65</div> <div class="sym"><a class="sym" href="terbium/biology.html" title="Terbium">Tb</a></div> <div class="at_wt">158.93</div> <div class="e_name">Terbium</div> </td> <td class="f"> <div class="at_num">66</div> <div class="sym"><a class="sym" href="dysprosium/biology.html" title="Dysprosium">Dy</a></div> <div class="at_wt">162.50</div> <div class="e_name">Dysprosium</div> </td> <td class="f"> <div class="at_num">67</div> <div class="sym"><a class="sym" href="holmium/biology.html" title="Holmium">Ho</a></div> <div class="at_wt">164.93</div> <div class="e_name">Holmium</div> </td> <td class="f"> <div class="at_num">68</div> <div class="sym"><a class="sym" href="erbium/biology.html" title="Erbium">Er</a></div> <div class="at_wt">167.26</div> <div class="e_name">Erbium</div> </td> <td class="f"> <div class="at_num">69</div> <div class="sym"><a class="sym" href="thulium/biology.html" title="Thulium">Tm</a></div> <div class="at_wt">168.93</div> <div class="e_name">Thulium</div> </td> <td class="f"> <div class="at_num">70</div> <div class="sym"><a class="sym" href="ytterbium/biology.html" title="Ytterbium">Yb</a></div> <div class="at_wt">173.05</div> <div class="e_name">Ytterbium</div> </td> <td colspan="2"></td> </tr> <tr> <th class="lbl" colspan="3">**Actinoids</th> <th class="v">**</th> <td class="f"> <div class="at_num">89</div> <div class="sym"><a class="sym" href="actinium/biology.html" title="Actinium">Ac</a> <small>☢</small></div> <div class="at_wt">227</div> <div class="e_name">Actinium</div> </td> <td class="f"> <div class="at_num">90</div> <div class="sym"><a class="sym" href="thorium/biology.html" title="Thorium">Th</a> <small>☢</small></div> <div class="at_wt">232.04</div> <div class="e_name">Thorium</div> </td> <td class="f"> <div class="at_num">91</div> <div class="sym"><a class="sym" href="protactinium/biology.html" title="Protactinium">Pa</a> <small>☢</small></div> <div class="at_wt">231.04</div> <div class="e_name">Protactinium</div> </td> <td class="f"> <div class="at_num">92</div> <div class="sym"><a class="sym" href="uranium/biology.html" title="Uranium">U</a> <small>☢</small></div> <div class="at_wt">238.03</div> <div class="e_name">Uranium</div> </td> <td class="f"> <div class="at_num">93</div> <div class="sym"><a class="sym" href="neptunium/biology.html" title="Neptunium">Np</a> <small>☢</small></div> <div class="at_wt">237</div> <div class="e_name">Neptunium</div> </td> <td class="f"> <div class="at_num">94</div> <div class="sym"><a class="sym" href="plutonium/biology.html" title="Plutonium">Pu</a> <small>☢</small></div> <div class="at_wt">244</div> <div class="e_name">Plutonium</div> </td> <td class="f"> <div class="at_num">95</div> <div class="sym"><a class="sym" href="americium/biology.html" title="Americium">Am</a> <small>☢</small></div> <div class="at_wt">243</div> <div class="e_name">Americium</div> </td> <td class="f"> <div class="at_num">96</div> <div class="sym"><a class="sym" href="curium/biology.html" title="Curium">Cm</a> <small>☢</small></div> <div class="at_wt">247</div> <div class="e_name">Curium</div> </td> <td class="f"> <div class="at_num">97</div> <div class="sym"><a class="sym" href="berkelium/biology.html" title="Berkelium">Bk</a> <small>☢</small></div> <div class="at_wt">247</div> <div class="e_name">Berkelium</div> </td> <td class="f"> <div class="at_num">98</div> <div class="sym"><a class="sym" href="californium/biology.html" title="Californium">Cf</a> <small>☢</small></div> <div class="at_wt">251</div> <div class="e_name">Californium</div> </td> <td class="f"> <div class="at_num">99</div> <div class="sym"><a class="sym" href="einsteinium/biology.html" title="Einsteinium">Es</a> <small>☢</small></div> <div class="at_wt">252</div> <div class="e_name">Einsteinium</div> </td> <td class="f"> <div class="at_num">100</div> <div class="sym"><a class="sym" href="fermium/biology.html" title="Fermium">Fm</a> <small>☢</small></div> <div class="at_wt">257</div> <div class="e_name">Fermium</div> </td> <td class="f"> <div class="at_num">101</div> <div class="sym"><a class="sym" href="mendelevium/biology.html" title="Mendelevium">Md</a> <small>☢</small></div> <div class="at_wt">258</div> <div class="e_name">Mendelevium</div> </td> <td class="f"> <div class="at_num">102</div> <div class="sym"><a class="sym" href="nobelium/biology.html" title="Nobelium">No</a> <small>☢</small></div> <div class="at_wt">259</div> <div class="e_name">Nobelium</div> </td> <td colspan="2"></td> </tr> </tbody> </table> </div> <p>The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically). The properties of elements in groups are similar in some respects to each other.</p> <div class="centre"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-9334432533380510" data-ad-slot="5668120788" data-ad-format="auto"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <p> There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here is very useful and the most common. The periodic table is a masterpiece of organised chemical information and the evolution of chemistry's periodic table into the current form is an astonishing achievement.</p> </article> </main> <aside> <div class="pure-g"> <div class="pure-u-1 pure-u-md-1-2 pure-u-lg-1-4"> <p class="padded_column">The International Union of Pure and Applied Chemistry (IUPAC) confirmed the names of elements 113, 115, 117, and 118 as:</p> <ul> <li><a href="nihonium/">Nihonium</a> (symbol Nh), for element 113</li> <li><a href="moscovium/">Moscovium</a> (symbol Mc), for element 115</li> <li><a href="tennessine/">Tennessine</a> (symbol Ts), for element 117</li> <li><a href="oganesson/">Oganesson</a> (symbol Og), for element 118</li> </ul> <p class="padded_column">This followed a 5-month period of public review after which the names earlier proposed by the discoverers were approved by IUPAC.</p> </div> <div class="pure-u-1 pure-u-md-1-2 pure-u-lg-1-4 centre"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-9334432533380510" data-ad-slot="4330988386" data-ad-format="auto"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <div class="pure-u-1 pure-u-md-1-2 pure-u-lg-1-4"> <p class="padded_column">You can buy this <strong>periodic table poster</strong> and more at the <a href="https://www.webelements.com/shop/product-category/posters/">WebElements periodic table shop</a>.<br /> <a href="https://www.webelements.com/shop/product/periodic-table-cartograms-poster-59-x-42-cm/"><img class="pure-img-responsive" src="https://www.webelements.com/_media/shop/webelements-A2-cartograms-2010_w460.jpg" alt="Periodic table cartograms poster" /></a></p> </div> <div class="pure-u-1 pure-u-md-1-2 pure-u-lg-1-4"> <p class="padded_column">On 1 May 2014 a paper published in <a href="http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.172501">Phys. Rev. Lett</a> by J. Khuyagbaatar and others states the superheavy element with atomic number Z = 117 (ununseptium) was produced as an evaporation residue in the <sup>48</sup>Ca and <sup>249</sup>Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allows measurement of decays of single atomic nuclei with very short half-lives. Two decay chains comprising seven α-decays and a spontaneous fission each were identified and assigned to the isotope <sup>294</sup>Uus (element 117) and its decay products.</p> </div> </div> </aside>  <footer> <div class="footer"> <div class="pure-g"> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Key properties</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/eneg_pauling/">Electronegativity </a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/melting_point/">Melting point</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/density/">Density </a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/molar_volume/">Molar volume</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/ionis_energy_1/">Ionization energy (first)</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/covalent_radius/">Covalent radius</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/metallic_radius/">Metallic radius</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/abund_crust/">Abundance (earth's crust)</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/periodicity/index/">Other properties</a></li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Shopping</li> <li class="pure-menu-item">Shop closed</li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Social</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.facebook.com/webelements.periodic.table">Facebook</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://twitter.com/periodic_table">Twitter</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.pinterest.com/periodictable/">Pinterest</a></li> </ul> </div> <div class="pure-u-1-2 pure-u-sm-1-2 pure-u-lg-1-4 pure-menu custom-restricted-width"> <ul class="pure-menu-list"> <li class="pure-menu-heading footer_h">Adminstration</li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/your-privacy/" title="Your privacy">Privacy</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/about-webelements/" title="About WebElements">About</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/webelements-and-copyright/" title="Copyright information about WebElements">Copyright</a></li> <li class="pure-menu-item"><a class="pure-menu-link" href="https://www.webelements.com/nexus/acknowledgements/" title="Acknowledgements">Thanks...</a></li> </ul> </div> </div> </div> <address> <p> <a href="https://www.webelements.com/"><img class="logo_m" src="_media/icons/logo_60.png" alt="WebElements home" /></a><br /> <strong>WebElements:</strong> THE periodic table on the WWW [<a href="https://www.webelements.com/">www.webelements.com</a>]<br /> <a href="https://www.webelements.com/nexus/webelements-and-copyright/">Copyright </a> 1993-2024 <a href="https://winter.group.shef.ac.uk/">Mark Winter</a> [ <a href="https://www.sheffield.ac.uk/chemistry/">The University of Sheffield </a> and WebElements Ltd, UK]. 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