From 0c2e2a7b6aa68949e2a2696949e75b8cb9e65e43 Mon Sep 17 00:00:00 2001
From: eggy <eggyrules@gmail.com>
Date: Tue, 3 Nov 2020 13:39:20 -0500
Subject: [PATCH] chem: add isoelectronic ec

---
 docs/sch3uz.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/sch3uz.md b/docs/sch3uz.md
index 7f8f880..aeecbe1 100644
--- a/docs/sch3uz.md
+++ b/docs/sch3uz.md
@@ -425,6 +425,8 @@ A **full** electron configuration of an element lists each of its orbital sublev
 
 A **condensed/abbreviated** electron configuration of an element replaces part of the full configuration with the closest noble gas with **less but not equal** electrons enclosed in square brackets.
 
+The electron configurations of an ion may be the same as a noble gas or another ion. In this case, the two configurations are known as **isoelectronic**.
+
 !!! example
     The condensed electron configuration of bromine is:
     $$\text{[Ar] 4s}^2\text{ 3d}^{10}\text{ 4p}^5$$