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diff --git a/Textbook_of_Engineering_Chemistry/dChapter_12.ipynb b/Textbook_of_Engineering_Chemistry/dChapter_12.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12:Coordination Chemistry"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example no:1,Page no:310"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "atomic_no=27       #Atomic on of Co\n",
+      "oxdn_state=3       #Oxidation state of Co\n",
+      "ele_donated=6*27   #Electron donated by ligand\n",
+      "\n",
+      "#Calculation\n",
+      "EAN=atomic_no-oxdn_state+ele_donated       #Effective atomic no\n",
+      "\n",
+      "#Result\n",
+      "print\"Effective Atomic no of [Co(NH3)6]Cl3 is \",EAN,\"which is equal to atomic no of Kr\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Effective Atomic no of [Co(NH3)6]Cl3 is  186 which is equal to atomic no of Kr\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file