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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# 1: Bonding in Solids"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Example number 1.1, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "potential energy is -3.981 eV\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration    \n",
+    "e=1.6*10**-19;      #charge(coulomb)\n",
+    "x=9*10**9;          \n",
+    "r0=2.81*10**-10;    #equilibrium distance(m)\n",
+    "A=1.748;      #madelung constant\n",
+    "n=9;       #repulsive exponent value\n",
+    "\n",
+    "#Calculations\n",
+    "U0=-(x*A*e/r0)*(1-1/n);       #potential energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"potential energy is\",round(U0/2,3),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Example number 1.2, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ionic cohesive energy is -6.45 eV\n",
+      "atomic cohesive energy is -6.17 eV\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration    \n",
+    "e=1.6*10**-19;      #charge(coulomb)\n",
+    "x=9*10**9;          \n",
+    "r0=3.56*10**-10;    #equilibrium distance(m)\n",
+    "A=1.763;      #madelung constant\n",
+    "n=10.5;       #repulsive exponent value\n",
+    "IE=3.89;      #ionisation energy(eV)\n",
+    "EA=-3.61;     #electron affinity(eV)\n",
+    "\n",
+    "#Calculations\n",
+    "U0=-(x*A*e/r0)*(1-1/n);       #ionic cohesive energy(eV)\n",
+    "U=U0+IE+EA;               #atomic cohesive energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"ionic cohesive energy is\",round(U0,2),\"eV\"\n",
+    "print \"atomic cohesive energy is\",round(U,2),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Example number 1.3, Page number 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "binding energy is 669 *10**3 kJ/kmol\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",
+    "N=6.02*10**26;           #Avagadro Number\n",
+    "e=1.6*10**-19;      #charge(coulomb)\n",
+    "x=9*10**9;          \n",
+    "r0=0.324*10**-9;    #equilibrium distance(m)\n",
+    "A=1.748;      #madelung constant\n",
+    "n=9.5;       #repulsive exponent value\n",
+    "\n",
+    "#Calculations\n",
+    "U0=(A*e*x/r0)*(1-1/n);     \n",
+    "U=round(U0,2)*N*e*10**-3;      #binding energy(kJ/kmol)\n",
+    "\n",
+    "#Result\n",
+    "print \"binding energy is\",int(U/10**3),\"*10**3 kJ/kmol\"\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
+}