diff --git a/education/chemistry/1.html b/education/chemistry/1.html
index 598f27a..9e76a07 100644
--- a/education/chemistry/1.html
+++ b/education/chemistry/1.html
@@ -2,7 +2,7 @@
 title: 1
 description: 
 published: true
-date: 2026-02-11T15:51:27.344Z
+date: 2026-02-11T15:57:59.376Z
 tags: 
 editor: ckeditor
 dateCreated: 2026-02-11T14:58:54.870Z
@@ -485,4 +485,93 @@ dateCreated: 2026-02-11T14:58:54.870Z
 <p>&nbsp;</p>
 <h3><span style="font-family:Arial, Helvetica, sans-serif;">Anion</span></h3>
 <p><span style="font-family:Arial, Helvetica, sans-serif;">Atom that gains e-, -ve ions</span></p>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">Usually group 5 to 7. Like N<sup>3-</sup>, S<sup>2-</sup>, Cl<sup>-</sup></span></p>
+<p>&nbsp;</p>
+<figure class="table">
+  <table>
+    <tbody>
+      <tr>
+        <td style="text-align:center;width:150px;"><span style="font-family:Arial, Helvetica, sans-serif;">&nbsp;</span></td>
+        <td style="text-align:center;width:200px;"><span style="font-family:Arial, Helvetica, sans-serif;"><strong>Name</strong></span></td>
+        <td style="text-align:center;width:200px;"><span style="font-family:Arial, Helvetica, sans-serif;"><strong>Composition</strong></span></td>
+        <td style="text-align:center;width:200px;"><span style="font-family:Arial, Helvetica, sans-serif;"><strong>Color (Water)</strong></span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">O<sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Oxide ion</span></td>
+        <td style="text-align:center;" rowspan="7"><span style="font-family:Arial, Helvetica, sans-serif;">Monoatomic</span></td>
+        <td style="text-align:center;" rowspan="3"><span style="font-family:Arial, Helvetica, sans-serif;">React</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">S<sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Sulphide ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">N<sup>3-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Nitride ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">F<sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Fluoride ion</span></td>
+        <td style="text-align:center;" rowspan="12"><span style="font-family:Arial, Helvetica, sans-serif;">Colorless</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Cl<sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Chloride ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Br<sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Bromide ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">I<sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Iodide ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">OH<sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Hydroxide ion</span></td>
+        <td style="text-align:center;" rowspan="10"><span style="font-family:Arial, Helvetica, sans-serif;">Polyatomic</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">NO<sub>2</sub><sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Nitrite ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">NO<sub>3</sub><sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Nitrate ion&nbsp;</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">SO<sub>3</sub><sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Sulphite ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">SO<sub>4</sub><sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Sulphate ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">HSO<sub>4</sub><sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Hydrogensulphate ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">CO<sub>3</sub><sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Carbonate ion&nbsp;</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">HCO<sub>3</sub><sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Hydrogencarbonate ion</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">MnO<sub>4</sub><sup>-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Permanganate ion</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Purple</span></td>
+      </tr>
+      <tr>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup></span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Dichromate ion</span></td>
+        <td style="text-align:center;"><span style="font-family:Arial, Helvetica, sans-serif;">Orange</span></td>
+      </tr>
+    </tbody>
+  </table>
+</figure>
+<p>&nbsp;</p>
 <p>&nbsp;</p>