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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 14: Bonding In Crystals"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example number 1, Page number 361"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "potential energy per ion pair is -3.981 eV\n",
+      "answer in the book varies due to rounding off errors\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration   \n",
+    "e=1.6*10**-19;           #charge of electron(coulomb)\n",
+    "r0=2.81*10**-10;             #distance between ions(m)\n",
+    "A=1.748;      #constant\n",
+    "x=9*10**9;         #let x=1/(4*math.pi*epsilon0)\n",
+    "n=9;          \n",
+    "\n",
+    "#Calculations\n",
+    "U0=-x*A*e**2*(1-(1/n))/(e*r0);       #potential energy per ion pair(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"potential energy per ion pair is\",round(U0/2,3),\"eV\"\n",
+    "print \"answer in the book varies due to rounding off errors\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}