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margin: .1em .5em;"><b>[<span class="plainlinks plainlinksneverexpand"><a rel="nofollow" class="external text" href="https://citizendium.org/wiki/index.php?title=Erbium&action=edit&section=0"><font size="2">edit intro</font></a></span>]</b></div> </td></tr></tbody></table></div> <div style="align:{{{align}}}; z-index:3;"> <table border="0" width="178" align="right" cellpadding="0" cellspacing="0" style="wrap=no"> <tbody><tr> <td width="100%"> <table border="1" width="160" align="center" cellpadding="3" cellspacing="0" style="background:#{{{background1}}}; wrap=no; border:1px solid #888;"> <tbody><tr> <td align="center" width="100%" bgcolor="#f2f2f2" style="border-top:2px solid #bbb"><b>Erbium</b> <table border="0" width="154" align="center" cellpadding="2" cellspacing="0" style="background:#{{{elementColor}}};"> <tbody><tr> <td colspan="2" align="left"><font size="1px"><a href="/wiki/Atomic_mass" title="Atomic mass">167.259(3)</a></font> </td> <td rowspan="3" valign="top" align="right" width="38"><font size="2px"><a href="/wiki/Oxidation_state" title="Oxidation state"><br /><br /><br /><br /></a></font> </td></tr> <tr> <td width="38">  </td> <td rowspan="2" align="center" width="78"><font size="6px"><b><a href="/wiki/Periodic_table_of_elements" title="Periodic table of elements">Er</a></b></font> </td></tr> <tr> <td align="left"><font size="4px"><a href="/wiki/Atomic_number" title="Atomic number"><b>68</b></a></font> </td></tr> <tr> <td align="left" colspan="2"><font size="1px"><a href="/wiki/Electron_configuration" title="Electron configuration">1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>3d<sup>10</sup>4s<sup>2</sup>4p<sup>6</sup> 4d<sup>10</sup>5s<sup>2</sup>5p<sup>6</sup>4f<sup>12</sup>6s<sup>2</sup></a></font> </td> <td align="right" colspan="1"><font size="2px" style="nowrap"></font> </td></tr></tbody></table> <table border="0" width="152" cellpadding="3" cellspacing="0"> <tbody><tr> <td style="border-top:2px solid #bbb" align="left" bgcolor="#f2f2f2"><font size="1"><span title="This is a navigable Periodic Table of the Elements. You can hover over each unit and click on it to see its current article!" style="border-bottom:1px dotted">[ ? ]</span></font> </td> <td style="border-top:2px solid #bbb" align="right" bgcolor="#f2f2f2"><font size="1"><b><a href="/wiki/Lanthanide" title="Lanthanide">Lanthanide</a>:</b></font> </td></tr> <tr> <td colspan="2" width="100%" bgcolor="#f2f2f2"> <table align="center" border="0" cellspacing="0" cellpadding="0"> <tbody><tr> <td><a href="/wiki/Hydrogen" title="Hydrogen"><div style="-moz-opacity:.2; opacity:.2; width:6px; height:9px; border-bottom:1px solid #000; border-left:1px solid #000; border-top:1px solid #888; border-right:1px solid #888; background-color:#ff1e00"><font style="size:0px;"></font> </div> </a> </td> <td colspan="16"><a href="/wiki/Periodic_table_of_elements" title="Periodic table of elements"><div style="width:128px; height:11px; background-color:#{{{background1}}}"><font style="size:0px;"></font> </div></a> </td> <td><a href="/wiki/Helium" title="Helium"><div style="-moz-opacity:.2; opacity:.2; width:6px; height:9px; border-bottom:1px solid #000; border-left:1px solid #000; border-top:1px solid #888; border-right:1px solid #888; background-color:#2fc900"><font style="size:0px;"></font> </div> </a> </td></tr> <tr> <td><a href="/wiki/Lithium" title="Lithium"><div style="-moz-opacity:.2; opacity:.2; width:6px; height:9px; border-bottom:1px solid #000; border-left:1px solid #000; border-top:1px solid #888; border-right:1px solid #888; background-color:#66ffff"><font style="size:0px;"></font> </div> </a> </td> <td><a href="/wiki/Beryllium" title="Beryllium"><div style="-moz-opacity:.2; opacity:.2; width:6px; height:9px; border-bottom:1px solid #000; border-left:1px solid #000; border-top:1px solid #888; border-right:1px solid #888; background-color:#00a8ff"><font style="size:0px;"></font> </div> </a> </td> <td colspan="10"><a href="/wiki/Periodic_table_of_elements" title="Periodic table of elements"><div style="width:80px; height:11px; background-color:#{{{background1}}}"><font style="size:0px;"></font> </div></a> </td> <td><a href="/wiki/Boron" title="Boron"><div style="-moz-opacity:.2; 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border-right:1px solid #888; background-color:#bb75ff"><font style="size:0px;"></font> </div> </a> </td> <td><a href="/wiki/Lawrencium" title="Lawrencium"><div style="-moz-opacity:.2; opacity:.2; width:6px; height:9px; border-bottom:1px solid #000; border-left:1px solid #000; border-top:1px solid #888; border-right:1px solid #888; background-color:#bb75ff"><font style="size:0px;"></font> </div> </a> </td> <td><a href="/wiki/Periodic_table_of_elements" title="Periodic table of elements"><div style="width:8px; height:11px; background-color:#{{{background1}}}"><font style="size:0px;"></font> </div></a> </td></tr></tbody></table> </td></tr> <tr> <td colspan="2" style="border-top:2px solid #bbb" width="100%" align="right" bgcolor="#f2f2f2"><font size="1"><b> <a href="/wiki/Erbium/Properties" title="Erbium/Properties">Properties</a>:</b></font> </td></tr> <tr> <td colspan="2" style="text-align: left;" width="100%" bgcolor="#ffffff"><font size="1"> Soft, bright, silvery, lustrous and malleable metal</font> </td></tr> </tbody></table> </td></tr></tbody></table> </td></tr></tbody></table> </div> <p><br /> <b>Erbium</b> is a <a href="/wiki/Chemical_elements" title="Chemical elements">chemical element</a>, having the <a href="/wiki/Chemical_symbol" title="Chemical symbol">chemical symbol</a> Er. Its <a href="/wiki/Atomic_number" title="Atomic number">atomic number</a> (the number of <a href="/wiki/Proton" title="Proton">protons</a>) is 68. It has a <a href="/wiki/Atomic_mass#Standard_atomic_weights_of_the_elements" title="Atomic mass">standard atomic weight</a> of 167.259 g•mol<sup> −1</sup> and is a <a href="/wiki/Solid" class="mw-redirect" title="Solid">solid</a> in its elemental form. </p><p>Erbium is considered a member of the "Lanthanide" class of elements. At a <a href="/wiki/Pressure" title="Pressure">pressure</a> of 101.325 k<a href="/wiki/Pascal_(unit)" title="Pascal (unit)">Pa</a>, it has a <a href="/wiki/Boiling_point" title="Boiling point">boiling point</a> of 2,868 °<a href="/wiki/Celsius_(unit)" title="Celsius (unit)">C</a> and a <a href="/wiki/Melting_point" title="Melting point">melting point</a> of 1,529 °C. </p>  </div> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://citizendium.org/wiki/index.php?title=Erbium&oldid=739767">https://citizendium.org/wiki/index.php?title=Erbium&oldid=739767</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a href="/wiki/Category:CZ_Live" title="Category:CZ Live">CZ Live</a></li><li><a href="/wiki/Category:Chemistry_Workgroup" title="Category:Chemistry Workgroup">Chemistry Workgroup</a></li><li><a href="/wiki/Category:Physics_Workgroup" title="Category:Physics Workgroup">Physics Workgroup</a></li><li><a href="/wiki/Category:Articles_written_in_American_English" title="Category:Articles written in American English">Articles written in American English</a></li><li><a href="/wiki/Category:All_Content" title="Category:All Content">All Content</a></li><li><a href="/wiki/Category:Chemistry_Content" title="Category:Chemistry Content">Chemistry Content</a></li><li><a href="/wiki/Category:Physics_Content" title="Category:Physics Content">Physics Content</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Chemistry_tag" title="Category:Chemistry tag">Chemistry tag</a></li><li><a href="/wiki/Category:Physics_tag" title="Category:Physics tag">Physics tag</a></li></ul></div></div> </div> </div> <div id="mw-navigation"> <h2>Navigation menu</h2> <div id="mw-head"> <nav id="p-personal" class="vector-menu mw-portlet mw-portlet-personal vector-user-menu-legacy" aria-labelledby="p-personal-label" role="navigation" > <h3 id="p-personal-label" class="vector-menu-heading " > <span class="vector-menu-heading-label">Personal tools</span> </h3> <div class="vector-menu-content"> <ul class="vector-menu-content-list"><li id="pt-login" class="mw-list-item"><a href="/wiki/index.php?title=Special:UserLogin&returnto=Erbium" title="To edit pages, [[Special:RequestAccount|get a contributor account]]. 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