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title: 1
description:
published: true
date: 2026-02-11T15:28:10.742Z
date: 2026-02-11T15:31:01.086Z
tags:
editor: ckeditor
dateCreated: 2026-02-11T14:58:54.870Z
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<p>&nbsp;</p>
<h3><span style="font-family:Arial, Helvetica, sans-serif;">Aufbau principle</span></h3>
<p><span style="font-family:Arial, Helvetica, sans-serif;">The lowest energy subshell or orbital will be filled first</span></p>
<p><span style="font-family:Arial, Helvetica, sans-serif;">1s &lt; 2s &lt; 2p &lt; 3s &lt; 3p &lt; 4s &lt; 3d</span><br><br>&nbsp;</p>
<p><span style="font-family:Arial, Helvetica, sans-serif;">1s &lt; 2s &lt; 2p &lt; 3s &lt; 3p &lt; 4s &lt; 3d</span><br>&nbsp;</p>
<p><span style="font-family:Arial, Helvetica, sans-serif;">Imagine drawing a line from right to left.</span></p>
<p><span style="font-family:Arial, Helvetica, sans-serif;">You should be able to find out that 4s subshell has a lower energy than 3d subshell this way.</span><br>&nbsp;</p>
<figure class="table">
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<td style="text-align:center;width:60px;"><span style="font-family:Arial, Helvetica, sans-serif;">1</span></td>
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