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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 1.4"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 8,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "net change in energy per mole is -296 kJ/mol\n",
-      "answer varies due to rounding off errors\n",
-      "since the net change in energy is negative, the A+B- molecule will be stable\n"
-     ]
-    }
-   ],
-   "source": [
-    "#importing modules\n",
-    "import math\n",
-    "from __future__ import division\n",
-    "\n",
-    "#Variable declaration\n",
-    "e=1.602*10**-19;   #charge of electron(c)\n",
-    "epsilon0=8.85*10**-12;    #permittivity(C/Nm)\n",
-    "r=3*10**-10;     #seperation(m)\n",
-    "N=6.022*10**20;\n",
-    "Ea=502;     #ionisation energy of A(kJ/mol)\n",
-    "Eb=-335;    #electron affinity for B(kJ/mol)\n",
-    "\n",
-    "#Calculation\n",
-    "E=-e**2*N/(4*math.pi*epsilon0*r);    #electrostatic attraction(kJ/mol)\n",
-    "nE=Ea+Eb+E;    #net change in energy per mole(kJ/mol)\n",
-    "\n",
-    "#Result\n",
-    "print \"net change in energy per mole is\",int(nE),\"kJ/mol\"\n",
-    "print \"answer varies due to rounding off errors\"\n",
-    "print \"since the net change in energy is negative, the A+B- molecule will be stable\""
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##Example number 1.2, Page number 1.4"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 14,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "energy required is 0.5 eV\n",
-      "seperation is 2.88 nm\n"
-     ]
-    }
-   ],
-   "source": [
-    "#importing modules\n",
-    "import math\n",
-    "from __future__ import division\n",
-    "\n",
-    "#Variable declaration\n",
-    "IPk=4.1;    #IP of K(eV)\n",
-    "EACl=3.6;    #EA of Cl(eV)\n",
-    "e=1.602*10**-19;   #charge of electron(c)\n",
-    "onebyepsilon0=9*10**9;\n",
-    "\n",
-    "#Calculation\n",
-    "deltaE=IPk-EACl;\n",
-    "Ec=deltaE;      #energy required(eV)\n",
-    "R=e*onebyepsilon0/deltaE;     #seperation(m)\n",
-    "\n",
-    "#Result\n",
-    "print \"energy required is\",Ec,\"eV\"\n",
-    "print \"seperation is\",round(R*10**9,2),\"nm\""
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##Example number 1.3, Page number 1.5"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 16,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "bond energy is 4.61 eV\n"
-     ]
-    }
-   ],
-   "source": [
-    "#importing modules\n",
-    "import math\n",
-    "from __future__ import division\n",
-    "\n",
-    "#Variable declaration\n",
-    "e=1.602*10**-19;   #charge of electron(c)\n",
-    "epsilon0=8.85*10**-12;    #permittivity(C/Nm)\n",
-    "r0=236*10**-12;     #seperation(m)\n",
-    "N=6.022*10**20;\n",
-    "IP=5.14;     #ionisation energy of A(kJ/mol)\n",
-    "EA=3.65;    #electron affinity for B(kJ/mol)\n",
-    "\n",
-    "#Calculation\n",
-    "Ue=-e**2/(4*math.pi*epsilon0*r0*e);    #potential energy(eV)\n",
-    "BE=-Ue-IP+EA;      #bond energy(eV)\n",
-    "\n",
-    "#Result\n",
-    "print \"bond energy is\",round(BE,2),\"eV\""
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "##Example number 1.4, Page number 1.18"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 18,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "cohesive energy is 7.965 eV\n"
-     ]
-    }
-   ],
-   "source": [
-    "#importing modules\n",
-    "import math\n",
-    "from __future__ import division\n",
-    "\n",
-    "#Variable declaration\n",
-    "A=1.748;       #madelung constant\n",
-    "n=9;     #born repulsive exponent\n",
-    "e=1.602*10**-19;   #charge of electron(c)\n",
-    "epsilon0=8.85*10**-12;    #permittivity(C/Nm)\n",
-    "r0=0.281*10**-9;     #seperation(m)\n",
-    "IE=5.14;     #ionisation energy of A(kJ/mol)\n",
-    "EA=3.61;    #electron affinity for B(kJ/mol)\n",
-    "\n",
-    "#Calculation\n",
-    "CE=A*e**2*(1-(1/n))/(4*math.pi*epsilon0*r0*e);      #cohesive energy(eV)\n",
-    "\n",
-    "#Result\n",
-    "print \"cohesive energy is\",round(CE,3),\"eV\""
-   ]
-  }
- ],
- "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
-}