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diff --git a/Material_Science/material_science_ch_4.ipynb b/Material_Science/material_science_ch_4.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4: Cohesion between atoms"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.1, page no-92"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Coulomb interatomic energy\n",
+      "\n",
+      "import math\n",
+      "#Variable declaration\n",
+      "R=2.81*10**-10                    # distance between oppositely charged ion\n",
+      "e=1.6*10**-19                     # Charge of an electron\n",
+      "eps=8.854*10**-12                 # epsilon\n",
+      "\n",
+      "#calculation\n",
+      "U=-(e**2)/(4*math.pi*eps*R)\n",
+      "\n",
+      "#Result\n",
+      "print('The Coulomb interatomic energy is %.2f eV'%(U*10**19/1.6))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The Coulomb interatomic energy is -5.12 eV\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file