From 7eafbc98c9056d50113630a9f347b24f25f5d6ec Mon Sep 17 00:00:00 2001
From: phidias <phidias@aperx.org>
Date: Wed, 11 Feb 2026 15:36:14 +0000
Subject: [PATCH] docs: update education/chemistry/1

---
 education/chemistry/1.html | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/education/chemistry/1.html b/education/chemistry/1.html
index 48356cd..ac5169a 100644
--- a/education/chemistry/1.html
+++ b/education/chemistry/1.html
@@ -2,7 +2,7 @@
 title: 1
 description: 
 published: true
-date: 2026-02-11T15:34:58.131Z
+date: 2026-02-11T15:36:13.726Z
 tags: 
 editor: ckeditor
 dateCreated: 2026-02-11T14:58:54.870Z
@@ -382,5 +382,10 @@ dateCreated: 2026-02-11T14:58:54.870Z
 <p><span style="font-family:Arial, Helvetica, sans-serif;">The electronic configuration of Cr (Chromium) and Cu (Copper) do not follow the order. The outer subshell become half or fully filled to gain extra stability.</span></p>
 <p><span style="font-family:Arial, Helvetica, sans-serif;">It is also because that 4s and 3d energy difference is small.</span></p>
 <p>&nbsp;</p>
+<h3><span style="font-family:Arial, Helvetica, sans-serif;">Periodic table groups</span></h3>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">Group 1 - Alkali metal</span></p>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">Group 2 - Alkaline earth metal</span></p>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">Group 17 (7) - Halogen</span></p>
+<p><span style="font-family:Arial, Helvetica, sans-serif;">Group 18 (8) - Noble gas</span></p>
 <p>&nbsp;</p>
 <p>&nbsp;</p>