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<div class="pure-menu pure-menu-open pure-menu-horizontal centre" role="navigation" style="background: #000 url(../../_media/elements/discharge/blank.png) repeat-y center; background-size:contain;"> <span><a class="pure-menu-heading" href="https://winter.group.shef.ac.uk/webelements/"><img height="30" src="../../_media/icons/logo_60.png" alt="WebElements logo" /></a> <span style="color:white;">Atomic radii (Clementi)</span></span> </div> </div> </div> <div id="main">  <div class="pure-g"> <div class="pure-u-1 pure-u-sm-1-1"> <div class="google_navbar_positioning"> <form action="https://www.google.com" id="cse-search-box"> <div> <input type="hidden" name="cx" value="partner-pub-9334432533380510:6223510783" /> <input type="hidden" name="ie" value="UTF-8" /> <input type="text" name="q" size="28" /> <input type="submit" name="sa" value="Search" /> </div> </form> <script> </script> </div> </div> </div> <main> <div class="pure-g"> <div class="pure-u-1 pure-u-sm-1-1"> <h1 class="z">Atomic radii (Clementi)</h1> </div> </div> <div class="pure-menu pure-menu-horizontal">   <ul class="pure-menu-list"> <li class="pure-menu-item pure-menu-selected z_menu"><a href="./" class="pure-menu-link">Atomic radii (Clementi)</a></li> <li class="pure-menu-item pure-menu-has-children pure-menu-allow-hover z_menu"><a href="./" class="pure-menu-link">Gallery of images</a> <ul class="pure-menu-children"> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="index.html">Periodic table gallery</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="heatscape.html">Heatscapes</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="bar_chart.html">Bar chart </a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_1.html">Group 1</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_2.html">Group 2</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_3.html">Group 3</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_4.html">Group 4</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_5.html">Group 5</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_6.html">Group 6</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_7.html">Group 7</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_8.html">Group 8</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_9.html">Group 9</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_10.html">Group 10</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_11.html">Group 11</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_12.html">Group 12</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_13.html">Group 13</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_14.html">Group 14</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_15.html">Group 15</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_16.html">Group 16</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_17.html">Group 17</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="group_18.html">Group 18</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_2sp.html">Period 2</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_3sp.html">Period 3</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_4sp.html">Period 4sp</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_4spd.html">Period 4</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_4d.html">Period 4d</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_5sp.html">Period 5sp</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_5spd.html">Period 5spd</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_5d.html">Period 5d</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_6sp.html">Period 6sp</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_6spd.html">Period 6spd</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_6spdf.html">Period 6</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_6d.html">Period 6d</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="period_6f.html">Period 6f</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="block_sp.html">s- and p-Block</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="block_d.html">d-Block</a></li> <li class="pure-menu-item, z_menu_item"><a class="pure-menu-link" href="block_f.html">f-Block</a></li> </ul> </li> </ul>     </div> <p>Many references give table of atomic radii. Sometimes in text books and other sources, the rather vague term "atomic radius" is not defined and in such cases it is therefore not clear what the values actually mean. The values given here for atomic radius are calculated values using methods outlined in reference 1.</p> <p>These values are calculated using self-consistent-field functions (reference 1). You should consult reference 1 for full details, but it is not light reading for most people. There is a correlation between the atomic radii as determined from these calculations and the radii of maximum charge density in the outermost shell of the atom.</p> <figure><img class="pure-img" src= "../../_media/periodicity/tables/periodicity_cityscape_white/atomic_radius_city_w.png" alt="Image showing periodicity of the chemical elements for atomic radii (Clementi) in a periodic table cityscape style." /><figcaption>Image showing periodicity of the chemical elements for atomic radii (Clementi) in a periodic table cityscape style.</figcaption></figure> <figure><img class="pure-img" src= "../../_media/periodicity/tables/periodicity_heatscape_white/atomic_radius_heat_w.png" alt="Image showing periodicity of the chemical elements for atomic radii (Clementi) in a periodic table heatscape style." /><figcaption>Image showing periodicity of the chemical elements for atomic radii (Clementi) in a periodic table heatscape style.</figcaption></figure> <figure><img class="pure-img" src= "../../_media/periodicity/tables/periodicity_spiral_heatscape_black/atomic_radius_sp_h_b.png" alt="Image showing periodicity of the chemical elements for atomic radii (Clementi) in a spiral periodic table heatscape style." /><figcaption>Image showing periodicity of the chemical elements for atomic radii (Clementi) in a spiral periodic table heatscape style.</figcaption></figure> <figure><img class="pure-img" src= "../../_media/periodicity/tables/periodicity_spiral_columns_white/atomic_radius_sp_c_w.png" alt="Image showing periodicity of the chemical elements for atomic radii (Clementi) in a 3D spiral periodic table column style." /><figcaption>Image showing periodicity of the chemical elements for atomic radii (Clementi) in a 3D spiral periodic table column style.</figcaption></figure> <figure><img class="pure-img" src= "../../_media/periodicity/tables/periodicity_columns_white/atomic_radius_col_w.png" alt="Image showing periodicity of the chemical elements for atomic radii (Clementi) in a 3D periodic table column style." /><figcaption>Image showing periodicity of the chemical elements for atomic radii (Clementi) in a 3D periodic table column style.</figcaption></figure> <figure></figure> <figure></figure> <div class="adsense_responsive"><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="4479092381" data-ad-format="auto"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script></div> <h2 class="z">Units</h2> <p>pm</p> <h2 class="heading2">Notes</h2> <p>None</p> <p>Select from the following links to see visual periodicity representations for atomic radii, covalent radii, and van der Waals radii. <a href="../ionic_radius/">Ionic radii</a> are also available.</p> <ul> <li><a class="pure-menu-link" href="../atomic_radius/">Atomic radii</a></li> <li><a class="pure-menu-link" href="../atom_radius_emp/">Atomic radii (empirical)</a></li> <li><a class="pure-menu-link" href="../atom_radius_absolute/">Atomic radii (absolute)</a></li> <li><a class="pure-menu-link" href="../atom_rad_dens_cut/">Atomic radii (density cutoff)</a></li> <li><a class="pure-menu-link" href="../covalent_radius/">Covalent radii</a></li> <li><a class="pure-menu-link" href="../covalent_rad_2008/">Covalent radii revisited (2008 values)</a></li> <li><a class="pure-menu-link" href="../rad_cov_single/">Covalent radii (molecular single bond)</a></li> <li><a class="pure-menu-link" href="../rad_cov_double/">Covalent radii (molecular double bond)</a></li> <li><a class="pure-menu-link" href="../rad_cov_triple/">Covalent radii (molecular triple bond)</a></li> <li><a class="pure-menu-link" href="../van_der_waals_rad/">Van der Waals radius</a></li> </ul> <h2 class="z">Literature sources</h2> <ol> <li>E. Clementi, D.L.Raimondi, and W.P. Reinhardt, <em>J. Chem. Phys.</em> 1963, <strong>38</strong>, 2686.</li> </ol> </main> <div class="table-responsive"> <table class="pure-table periodic-table"> <caption class="periodic_table_caption">Explore the element of your choice through this periodic table.</caption> <thead> <tr> <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> <td class="s"> <div class="at_num">1</div> <div class="sym"><a class="sym" href="../../hydrogen/" title="Hydrogen">H</a></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/" title="Helium">He</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">3</div> <div class="sym"><a class="sym" href="../../lithium/" title="Lithium">Li</a></div> </td> <td class="s"> <div class="at_num">4</div> <div class="sym"><a class="sym" href="../../beryllium/" title="Beryllium">Be</a></div> </td> <td colspan="11"></td> <td class="p"> <div class="at_num">5</div> <div class="sym"><a class="sym" href="../../boron/" title="|title_5">B</a></div> </td> <td class="p"> <div class="at_num">6</div> <div class="sym"><a class="sym" href="../../carbon/" title="|title_6">C</a></div> </td> <td class="p"> <div class="at_num">7</div> <div class="sym"><a class="sym" href="../../nitrogen/" title="Nitrogen">N</a></div> </td> <td class="p"> <div class="at_num">8</div> <div class="sym"><a class="sym" href="../../oxygen/" title="Oxygen">O</a></div> </td> <td class="p"> <div class="at_num">9</div> <div class="sym"><a class="sym" href="../../fluorine/" title="Fluorine">F</a></div> </td> <td class="p"> <div class="at_num">10</div> <div class="sym"><a class="sym" href="../../neon/" title="Neon">Ne</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">11</div> <div class="sym"><a class="sym" href="../../sodium/" title="Sodium">Na</a></div> </td> <td class="s"> <div class="at_num">12</div> <div class="sym"><a class="sym" href="../../magnesium/" title="Magnesium">Mg</a></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/" title="Aluminium">Al</a></div> </td> <td class="p"> <div class="at_num">14</div> <div class="sym"><a class="sym" href="../../silicon/" title="Silicon">Si</a></div> </td> <td class="p"> <div class="at_num">15</div> <div class="sym"><a class="sym" href="../../phosphorus/" title="Phosphorus">P</a></div> </td> <td class="p"> <div class="at_num">16</div> <div class="sym"><a class="sym" href="../../sulfur/" title="Sulfur">S</a> </div> </td> <td class="p"> <div class="at_num">17</div> <div class="sym"><a class="sym" href="../../chlorine/" title="Chlorine">Cl</a></div> </td> <td class="p"> <div class="at_num">18</div> <div class="sym"><a class="sym" href="../../argon/" title="Argon">Ar</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">19</div> <div class="sym"><a class="sym" href="../../potassium/" title="Potassium">K</a></div> </td> <td class="s"> <div class="at_num">20</div> <div class="sym"><a class="sym" href="../../calcium/" title="Calcium">Ca</a></div> </td> <td class="void"></td> <td class="d"> <div class="at_num">21</div> <div class="sym"><a class="sym" href="../../scandium/" title="Scandium">Sc</a></div> </td> <td class="d"> <div class="at_num">22</div> <div class="sym"><a class="sym" href="../../titanium/" title="Titanium">Ti</a></div> </td> <td class="d"> <div class="at_num">23</div> <div class="sym"><a class="sym" href="../../vanadium/" title="Vanadium">V</a></div> </td> <td class="d"> <div class="at_num">24</div> <div class="sym"><a class="sym" href="../../chromium/" title="Chromium">Cr</a></div> </td> <td class="d"> <div class="at_num">25</div> <div class="sym"><a class="sym" href="../../manganese/" title="Manganese">Mn</a></div> </td> <td class="d"> <div class="at_num">26</div> <div class="sym"><a class="sym" href="../../iron/" title="Iron">Fe</a></div> </td> <td class="d"> <div class="at_num">27</div> <div class="sym"><a class="sym" href="../../cobalt/" title="Cobalt">Co</a></div> </td> <td class="d"> <div class="at_num">28</div> <div class="sym"><a class="sym" href="../../nickel/" title="Nickel">Ni</a></div> </td> <td class="d"> <div class="at_num">29</div> <div class="sym"><a class="sym" href="../../copper/" title="Copper">Cu</a></div> </td> <td class="d"> <div class="at_num">30</div> <div class="sym"><a class="sym" href="../../zinc/" title="Zinc">Zn</a></div> </td> <td class="p"> <div class="at_num">31</div> <div class="sym"><a class="sym" href="../../gallium/" title="Gallium">Ga</a></div> </td> <td class="p"> <div class="at_num">32</div> <div class="sym"><a class="sym" href="../../germanium/" title="Germanium">Ge</a></div> </td> <td class="p"> <div class="at_num">33</div> <div class="sym"><a class="sym" href="../../arsenic/" title="Arsenic">As</a></div> </td> <td class="p"> <div class="at_num">34</div> <div class="sym"><a class="sym" href="../../selenium/" title="Selenium">Se</a></div> </td> <td class="p"> <div class="at_num">35</div> <div class="sym"><a class="sym" href="../../bromine/" title="Bromine">Br</a></div> </td> <td class="p"> <div class="at_num">36</div> <div class="sym"><a class="sym" href="../../krypton/" title="Krypton">Kr</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">37</div> <div class="sym"><a class="sym" href="../../rubidium/" title="Rubidium">Rb</a></div> </td> <td class="s"> <div class="at_num">38</div> <div class="sym"><a class="sym" href="../../strontium/" title="Strontium">Sr</a></div> </td> <td class="void"></td> <td class="d"> <div class="at_num">39</div> <div class="sym"><a class="sym" href="../../yttrium/" title="Yttrium">Y</a></div> </td> <td class="d"> <div class="at_num">40</div> <div class="sym"><a class="sym" href="../../zirconium/" title="Zirconium">Zr</a></div> </td> <td class="d"> <div class="at_num">41</div> <div class="sym"><a class="sym" href="../../niobium/" title="Niobium">Nb</a></div> </td> <td class="d"> <div class="at_num">42</div> <div class="sym"><a class="sym" href="../../molybdenum/" title="Molybdenum">Mo</a></div> </td> <td class="d"> <div class="at_num">43</div> <div class="sym"><a class="sym" href="../../technetium/" title="Technetium">Tc</a></div> </td> <td class="d"> <div class="at_num">44</div> <div class="sym"><a class="sym" href="../../ruthenium/" title="Ruthenium">Ru</a></div> </td> <td class="d"> <div class="at_num">45</div> <div class="sym"><a class="sym" href="../../rhodium/" title="Rhodium">Rh</a></div> </td> <td class="d"> <div class="at_num">46</div> <div class="sym"><a class="sym" href="../../palladium/" title="Palladium">Pd</a></div> </td> <td class="d"> <div class="at_num">47</div> <div class="sym"><a class="sym" href="../../silver/" title="Silver">Ag</a></div> </td> <td class="d"> <div class="at_num">48</div> <div class="sym"><a class="sym" href="../../cadmium/" title="Cadmium">Cd</a></div> </td> <td class="p"> <div class="at_num">49</div> <div class="sym"><a class="sym" href="../../indium/" title="Indium">In</a></div> </td> <td class="p"> <div class="at_num">50</div> <div class="sym"><a class="sym" href="../../tin/" title="Tin">Sn</a></div> </td> <td class="p"> <div class="at_num">51</div> <div class="sym"><a class="sym" href="../../antimony/" title="Antimony">Sb</a></div> </td> <td class="p"> <div class="at_num">52</div> <div class="sym"><a class="sym" href="../../tellurium/" title="Tellurium">Te</a></div> </td> <td class="p"> <div class="at_num">53</div> <div class="sym"><a class="sym" href="../../iodine/" title="Iodine">I</a></div> </td> <td class="p"> <div class="at_num">54</div> <div class="sym"><a class="sym" href="../../xenon/" title="Xenon">Xe</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">55</div> <div class="sym"><a class="sym" href="../../caesium/" title="Caesium">Cs</a></div> </td> <td class="s"> <div class="at_num">56</div> <div class="sym"><a class="sym" href="../../barium/" title="Barium">Ba</a></div> </td> <th class="asterisk">*</th> <td class="d"> <div class="at_num xd">71</div> <div class="sym"><a class="sym" href="../../lutetium/" title="Lutetium">Lu</a></div> </td> <td class="d"> <div class="at_num">72</div> <div class="sym"><a class="sym" href="../../hafnium/" title="Hafnium">Hf</a></div> </td> <td class="d"> <div class="at_num">73</div> <div class="sym"><a class="sym" href="../../tantalum/" title="Tantalum">Ta</a></div> </td> <td class="d"> <div class="at_num">74</div> <div class="sym"><a class="sym" href="../../tungsten/" title="Tungsten">W</a></div> </td> <td class="d"> <div class="at_num">75</div> <div class="sym"><a class="sym" href="../../rhenium/" title="Rhenium">Re</a></div> </td> <td class="d"> <div class="at_num">76</div> <div class="sym"><a class="sym" href="../../osmium/" title="Osmium">Os</a></div> </td> <td class="d"> <div class="at_num">77</div> <div class="sym"><a class="sym" href="../../iridium/" title="Iridium">Ir</a></div> </td> <td class="d"> <div class="at_num">78</div> <div class="sym"><a class="sym" href="../../platinum/" title="Platinum">Pt</a></div> </td> <td class="d"> <div class="at_num">79</div> <div class="sym"><a class="sym" href="../../gold/" title="Gold">Au</a></div> </td> <td class="d"> <div class="at_num">80</div> <div class="sym"><a class="sym" href="../../mercury/" title="Mercury">Hg</a></div> </td> <td class="p"> <div class="at_num">81</div> <div class="sym"><a class="sym" href="../../thallium/" title="Thallium">Tl</a></div> </td> <td class="p"> <div class="at_num">82</div> <div class="sym"><a class="sym" href="../../lead/" title="Lead">Pb</a></div> </td> <td class="p"> <div class="at_num">83</div> <div class="sym"><a class="sym" href="../../bismuth/" title="Bismuth">Bi</a></div> </td> <td class="p"> <div class="at_num">84</div> <div class="sym"><a class="sym" href="../../polonium/" title="Polonium">Po</a></div> </td> <td class="p"> <div class="at_num">85</div> <div class="sym"><a class="sym" href="../../astatine/" title="Astatine">At</a></div> </td> <td class="p"> <div class="at_num">86</div> <div class="sym"><a class="sym" href="../../radon/" title="Radon">Rn</a></div> </td> </tr> <tr> <td class="s"> <div class="at_num">87</div> <div class="sym"><a class="sym" href="../../francium/" title="Francium">Fr</a></div> </td> <td class="s"> <div class="at_num">88</div> <div class="sym"><a class="sym" href="../../radium/" title="Radium">Ra</a></div> </td> <th class="v">**</th> <td class="d"> <div class="at_num">103</div> <div class="sym"><a class="sym" href="../../lawrencium/" title="Lawrencium">Lr</a></div> </td> <td class="d"> <div class="at_num">104</div> <div class="sym"><a class="sym" href="../../rutherfordium/" title="Rutherfordium">Rf</a></div> </td> <td class="d"> <div class="at_num">105</div> <div class="sym"><a class="sym" href="../../dubnium/" title="Dubnium">Db</a></div> </td> <td class="d"> <div class="at_num">106</div> <div class="sym"><a class="sym" href="../../seaborgium/" title="Seaborgium">Sg</a></div> </td> <td class="d"> <div class="at_num">107</div> <div class="sym"><a class="sym" href="../../bohrium/" title="Bohrium">Bh</a></div> </td> <td class="d"> <div class="at_num">108</div> <div class="sym"><a class="sym" href="../../hassium/" title="Hassium">Hs</a></div> </td> <td class="d"> <div class="at_num">109</div> <div class="sym"><a class="sym" href="../../meitnerium/" title="Meitnerium">Mt</a></div> </td> <td class="d"> <div class="at_num">110</div> <div class="sym"><a class="sym" href="../../darmstadtium/" title="Darmstadtium">Ds</a></div> </td> <td class="d"> <div class="at_num">111</div> <div class="sym"><a class="sym" href="../../roentgenium/" title="Roentgenium">Rg</a></div> </td> <td class="d"> <div class="at_num">112</div> <div class="sym"><a class="sym" href="../../copernicium/" title="Copernicium">Cn</a></div> </td> <td class="p"> <div class="at_num">113</div> <div class="sym"><a class="sym" href="../../nihonium/" title="Nihonium">Nh</a></div> </td> <td class="p"> <div class="at_num">114</div> <div class="sym"><a class="sym" href="../../flerovium/" title="Flerovium">Fl</a></div> </td> <td class="p"> <div class="at_num">115</div> <div class="sym"><a class="sym" href="../../moscovium/" title="Moscovium">Mc</a></div> </td> <td class="p"> <div class="at_num">116</div> <div class="sym"><a class="sym" href="../../livermorium/" title="Livermorium">Lv</a></div> </td> <td class="p"> <div class="at_num">117</div> <div class="sym"><a class="sym" href="../../tennessine/" title="Tennessine">Ts</a></div> </td> <td class="p"> <div class="at_num">118</div> <div class="sym"><a class="sym" href="../../oganesson/" title="Oganesson">Og</a></div> </td> </tr> <tr> <td colspan="19" class="v"> </td> </tr> <tr> <th class="lbl" colspan="2">*Lanthanoids</th> <th class="v">*</th> <td class="f"> <div class="at_num">57</div> <div class="sym"><a class="sym" href="../../lanthanum/" title="Lanthanum">La</a></div> </td> <td class="f"> <div class="at_num">58</div> <div class="sym"><a class="sym" href="../../cerium/" title="Cerium">Ce</a></div> </td> <td class="f"> <div class="at_num">59</div> <div class="sym"><a class="sym" href="../../praseodymium/" title="Praseodymium">Pr</a></div> </td> <td class="f"> <div class="at_num">60</div> <div class="sym"><a class="sym" href="../../neodymium/" title="Neodymium">Nd</a></div> </td> <td class="f"> <div class="at_num">61</div> <div class="sym"><a class="sym" href="../../promethium/" title="Promethium">Pm</a></div> </td> <td class="f"> <div class="at_num">62</div> <div class="sym"><a class="sym" href="../../samarium/" title="Samarium">Sm</a></div> </td> <td class="f"> <div class="at_num">63</div> <div class="sym"><a class="sym" href="../../europium/" title="Europium">Eu</a></div> </td> <td class="f"> <div class="at_num">64</div> <div class="sym"><a class="sym" href="../../gadolinium/" title="Gadolinium">Gd</a></div> </td> <td class="f"> <div class="at_num">65</div> <div class="sym"><a class="sym" href="../../terbium/" title="Terbium">Tb</a></div> </td> <td class="f"> <div class="at_num">66</div> <div class="sym"><a class="sym" href="../../dysprosium/" title="Dysprosium">Dy</a></div> </td> <td class="f"> <div class="at_num">67</div> <div class="sym"><a class="sym" href="../../holmium/" title="Holmium">Ho</a></div> </td> <td class="f"> <div class="at_num">68</div> <div class="sym"><a class="sym" href="../../erbium/" title="Erbium">Er</a></div> </td> <td class="f"> <div class="at_num">69</div> <div class="sym"><a class="sym" href="../../thulium/" title="Thulium">Tm</a></div> </td> <td class="f"> <div class="at_num">70</div> <div class="sym"><a class="sym" href="../../ytterbium/" title="Ytterbium">Yb</a></div> </td> <td colspan="2"></td> </tr> <tr> <th class="lbl" colspan="2">**Actinoids</th> <th class="v">**</th> <td class="f"> <div class="at_num">89</div> <div class="sym"><a class="sym" href="../../actinium/" title="Actinium">Ac</a></div> </td> <td class="f"> <div class="at_num">90</div> <div class="sym"><a class="sym" href="../../thorium/" title="Thorium">Th</a></div> </td> <td class="f"> <div class="at_num">91</div> <div class="sym"><a class="sym" href="../../protactinium/" title="Protactinium">Pa</a></div> </td> <td class="f"> <div class="at_num">92</div> <div class="sym"><a class="sym" href="../../uranium/" title="Uranium">U</a></div> </td> <td class="f"> <div class="at_num">93</div> <div class="sym"><a class="sym" href="../../neptunium/" title="Neptunium">Np</a></div> </td> <td class="f"> <div class="at_num">94</div> <div class="sym"><a class="sym" href="../../plutonium/" title="Plutonium">Pu</a></div> </td> <td class="f"> <div class="at_num">95</div> <div class="sym"><a class="sym" href="../../americium/" title="Americium">Am</a></div> </td> <td class="f"> <div class="at_num">96</div> <div class="sym"><a class="sym" href="../../curium/" title="Curium">Cm</a></div> </td> <td class="f"> <div class="at_num">97</div> <div class="sym"><a class="sym" href="../../berkelium/" title="Berkelium">Bk</a></div> </td> <td class="f"> <div class="at_num">98</div> <div class="sym"><a class="sym" href="../../californium/" title="Californium">Cf</a></div> </td> <td class="f"> <div class="at_num">99</div> <div class="sym"><a class="sym" href="../../einsteinium/" title="Einsteinium">Es</a></div> </td> <td class="f"> <div class="at_num">100</div> <div class="sym"><a class="sym" href="../../fermium/" title="Fermium">Fm</a></div> </td> <td class="f"> <div class="at_num">101</div> <div class="sym"><a class="sym" href="../../mendelevium/" title="Mendelevium">Md</a></div> </td> <td class="f"> <div class="at_num">102</div> <div class="sym"><a class="sym" href="../../nobelium/" title="Nobelium">No</a></div> </td> <td colspan="2"></td> </tr> </tbody> </table> </div> <div id="footer"> <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" 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