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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#2: Chemical Bonds"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 2.1, Page number 2.21"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "-2*a/r**3 + 90*b/r**11\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "from sympy import *\n",
+    "import numpy as np\n",
+    "\n",
+    "#Variable declaration\n",
+    "n=1;\n",
+    "m=9;\n",
+    "a=Symbol('a')\n",
+    "b=Symbol('b')\n",
+    "r=Symbol('r')\n",
+    "\n",
+    "#Calculation\n",
+    "y=(-a/(r**n))+(b/(r**m));\n",
+    "y=diff(y,r);\n",
+    "y=diff(y,r);\n",
+    "\n",
+    "#Result\n",
+    "print y"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "young's modulus is 157 GPa\n"
+     ]
+    }
+   ],
+   "source": [
+    "#since the values of a,b,r are declared as symbols in the above cell, it cannot be solved there. hence it is being solved here with the given variable declaration\n",
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "a=7.68*10**-29;     \n",
+    "r0=2.5*10**-10;    #radius(m)\n",
+    "\n",
+    "#Calculation\n",
+    "b=a*(r0**8)/9;\n",
+    "y=((-2*a*r0**8)+(90*b))/r0**11;    \n",
+    "E=y/r0;           #young's modulus(Pa)\n",
+    "\n",
+    "#Result\n",
+    "print \"young's modulus is\",int(E/10**9),\"GPa\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 2.2, Page number 2.22"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "effective charge is 0.72 *10**-19 coulomb\n",
+      "answer given in the book is wrong\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "dm=1.98*(10**-29)*(1/3);      #dipole moment\n",
+    "l=0.92*10**-10;        #bond length(m)\n",
+    "\n",
+    "#Calculation\n",
+    "ec=dm/l;        #effective charge(coulomb)\n",
+    "\n",
+    "#Result\n",
+    "print \"effective charge is\",round(ec*10**19,2),\"*10**-19 coulomb\"\n",
+    "print \"answer given in the book is wrong\""
+   ]
+  }
+ ],
+ "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": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}