diff --git a/education/chemistry/1.html b/education/chemistry/1.html
index a4bd8f8..a463f97 100644
--- a/education/chemistry/1.html
+++ b/education/chemistry/1.html
@@ -2,7 +2,7 @@
 title: 1
 description: 
 published: true
-date: 2026-02-11T15:07:17.596Z
+date: 2026-02-11T15:08:47.596Z
 tags: 
 editor: ckeditor
 dateCreated: 2026-02-11T14:58:54.870Z
@@ -55,3 +55,32 @@ dateCreated: 2026-02-11T14:58:54.870Z
 <p><span style="font-family:Arial, Helvetica, sans-serif;">Each element has a unique atomic number (or the number of proton).</span></p>
 <p>&nbsp;</p>
 <h3><span style="font-family:Arial, Helvetica, sans-serif;">Electronic arrangement</span></h3>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">The maximum number of electron that a shell can hold is 2(n)<sup>2</sup></span></p>
+<p>&nbsp;</p>
+<figure class="table">
+  <table>
+    <tbody>
+      <tr>
+        <td style="text-align:center;width:100px;"><span style="font-family:Arial, Helvetica, sans-serif;">n</span></td>
+        <td style="text-align:center;width:100px;"><span style="font-family:Arial, Helvetica, sans-serif;">max</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">1</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">2</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">2</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">8</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">3</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">18</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">4</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">32</span></td>
+      </tr>
+    </tbody>
+  </table>
+</figure>
+<p>&nbsp;</p>