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diff --git a/sample_notebooks/Sadananda CharyArroju/Chapter1.ipynb b/sample_notebooks/Sadananda CharyArroju/Chapter1.ipynb
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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": 15,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "bond energy is 3.84 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=23.6*10**-10;    #equilibrium distance(m)\n",
+    "I=5.14;    #ionisation energy(eV)\n",
+    "EA=3.65;   #electron affinity(eV)\n",
+    "N=8;     #born constant\n",
+    "\n",
+    "#Calculation\n",
+    "x=1-(1/N);\n",
+    "V=(e**2)*x/(4*e*math.pi*epsilon0*r0);   #potential(V)\n",
+    "E=I-EA;        #net energy(eV)\n",
+    "BE=round(V*10,2)-E;        #bond energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"bond energy is\",BE,\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.2, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "compressibility is -25.1095 *10**14\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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.41*10**-3;    #equilibrium distance(m)\n",
+    "A=1.76;      #madelung constant\n",
+    "n=0.5;       #repulsive exponent value\n",
+    "\n",
+    "#Calculation\n",
+    "beta=72*math.pi*epsilon0*r0**4/(A*e**2*(n-1));    #compressibility\n",
+    "\n",
+    "#Result\n",
+    "print \"compressibility is\",round(beta/10**14,4),\"*10**14\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.3, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "cohesive energy is -3.065 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.314*10**-9;    #equilibrium distance(m)\n",
+    "A=1.75;      #madelung constant\n",
+    "N=5.77;     #born constant\n",
+    "I=4.1;    #ionisation energy(eV)\n",
+    "EA=3.6;   #electron affinity(eV)\n",
+    "\n",
+    "#Calculation\n",
+    "V=-A*e**2*((N-1)/N)/(4*e*math.pi*epsilon0*r0);\n",
+    "PE=round(V,2)/2;    #potential energy per ion(eV)\n",
+    "x=(I-EA)/2;\n",
+    "CE=PE+x;   #cohesive energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"cohesive energy is\",CE,\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.4, Page number 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "binding energy is 665.0 *10**3 kJ/kmol\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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.324*10**-9;    #equilibrium distance(m)\n",
+    "A=1.75;      #madelung constant\n",
+    "n=8.5;       #repulsive exponent value\n",
+    "\n",
+    "#Calculations\n",
+    "U0=(A*e/(4*math.pi*epsilon0*r0))*(1-1/n);     \n",
+    "U=round(U0,1)*N*e;      #binding energy(J/kmol)\n",
+    "\n",
+    "#Result\n",
+    "print \"binding energy is\",round(U/10**6),\"*10**3 kJ/kmol\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.5, Page number 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 36,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "density of CsClis 4.389 *10**3 kg/m**3\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "rCs=0.165*10**-9;    #radius(m)\n",
+    "rCl=0.181*10**-9;    #radius(m)\n",
+    "MCs=133;    #atomic weight\n",
+    "MCl=35.5;   #atomic weight\n",
+    "N=6.02*10**26;           #Avagadro Number\n",
+    "\n",
+    "#Calculation\n",
+    "a=2*(rCl+rCs)/math.sqrt(3);     #lattice constant(m)\n",
+    "M=(MCs+MCl)/N;       #mass of 1 molecule(kg)\n",
+    "V=a**3;    #volume of unit cell(m**3)\n",
+    "rho=M/V;    #density of CsCl(kg/m**3)\n",
+    "\n",
+    "#Result\n",
+    "print \"density of CsClis\",round(rho/10**3,3),\"*10**3 kg/m**3\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.6, Page number 12"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 37,
+   "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\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.7, Page number 12"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "energy required is -1.9 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r=0.5*10**-9;    #distance(m)\n",
+    "I=5;    #ionisation energy(eV)\n",
+    "E=4;   #electron affinity(eV)\n",
+    "\n",
+    "#Calculation\n",
+    "C=e**2/(4*math.pi*epsilon0*e*r);    #coulomb energy(eV)\n",
+    "Er=I-E-C;    #energy required(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"energy required is\",round(Er,1),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.9, Page number 13"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 43,
+   "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": 44,
+   "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\""
+   ]
+  }
+ ],
+ "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
+}
diff --git a/sample_notebooks/Sadananda CharyArroju/Chapter10.ipynb b/sample_notebooks/Sadananda CharyArroju/Chapter10.ipynb
new file mode 100755
index 00000000..bd43d700
--- /dev/null
+++ b/sample_notebooks/Sadananda CharyArroju/Chapter10.ipynb
@@ -0,0 +1,431 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#10: Superconductivity"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.1, Page number 224"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical field is 3.365 *10**3 A/m\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "T=5;     #temperature(K)\n",
+    "Tc=7.2;   #critical temperature(K)\n",
+    "H0=6.5*10**3;   #critical magnetic field(A/m)\n",
+    "\n",
+    "#Calculation\n",
+    "Hc=H0*(1-(T/Tc)**2);    #critical field(A/m)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical field is\",round(Hc/10**3,3),\"*10**3 A/m\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.2, Page number 225"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical field is 1.567 *10**3 A/m\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "T=2.5;     #temperature(K)\n",
+    "Tc=3.5;   #critical temperature(K)\n",
+    "H0=3.2*10**3;   #critical magnetic field(A/m)\n",
+    "\n",
+    "#Calculation\n",
+    "Hc=H0*(1-(T/Tc)**2);    #critical field(A/m)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical field is\",round(Hc/10**3,3),\"*10**3 A/m\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.3, Page number 225"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical temperature is 6.928 K\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",
+    "Hc=5*10**3;    #critical magnetic field(A/m)\n",
+    "T=6;     #temperature(K)\n",
+    "H0=2*10**4;   #critical magnetic field(A/m)\n",
+    "\n",
+    "#Calculation\n",
+    "Tc=T/math.sqrt(1-(Hc/H0));     #critical temperature(K)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical temperature is\",round(Tc,3),\"K\"\n",
+    "print \"answer given in the book is wrong\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.4, Page number 225"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical current is 251.3 amp\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "Hc=2*10**3;    #critical magnetic field(A/m)\n",
+    "r=0.02;    #radius(m)\n",
+    "\n",
+    "#Calculation\n",
+    "Ic=2*math.pi*r*Hc;     #critical current(amp)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical current is\",round(Ic,1),\"amp\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.5, Page number 225"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "isotopic mass is 191.75 amu\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "T1=5;     #temperature(K)\n",
+    "T2=5.1;     #temperature(K)\n",
+    "M1=199.5;   #isotopic mass(amu)\n",
+    "\n",
+    "#Calculation\n",
+    "M2=M1*(T1/T2)**2;    #isotopic mass(amu)\n",
+    "\n",
+    "#Result\n",
+    "print \"isotopic mass is\",round(M2,2),\"amu\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.6, Page number 226"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical field is 3.0469 *10**4 A/m\n",
+      "critical current is 287.161 amp\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",
+    "T=5;     #temperature(K)\n",
+    "Tc=8;   #critical temperature(K)\n",
+    "H0=5*10**4;   #critical magnetic field(A/m)\n",
+    "r=1.5*10**-3;    #radius(m)\n",
+    "\n",
+    "#Calculation\n",
+    "Hc=H0*(1-(T/Tc)**2);    #critical field(A/m)\n",
+    "Ic=2*math.pi*r*Hc;     #critical current(amp)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical field is\",round(Hc/10**4,4),\"*10**4 A/m\"\n",
+    "print \"critical current is\",round(Ic,3),\"amp\"\n",
+    "print \"answer given in the book is wrong\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.7, Page number 226"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical temperature is 4.1447 K\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "Tc1=4.185;     #critical temperature(K)\n",
+    "M1=199.5;   #isotopic mass(amu)\n",
+    "M2=203.4;   #isotopic mass(amu)\n",
+    "\n",
+    "#Calculation\n",
+    "Tc2=Tc1*math.sqrt(M1/M2);      #critical temperature(K)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical temperature is\",round(Tc2,4),\"K\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.8, Page number 226"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "frequency is 4.105 *10**11 Hz\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "e=1.6*10**-19;    #charge(c)\n",
+    "h=6.626*10**-36;   #plank constant\n",
+    "V=8.5*10**-6;    #voltage(V)\n",
+    "\n",
+    "#Calculation\n",
+    "new=2*e*V/h;    #frequency(Hz)\n",
+    "\n",
+    "#Result\n",
+    "print \"frequency is\",round(new/10**11,3),\"*10**11 Hz\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.9, Page number 227"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "critical temperature is 30.0 K\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "Tc1=5;     #critical temperature(K)\n",
+    "P1=1;   #pressure(mm)\n",
+    "P2=6;   #pressure(mm)\n",
+    "\n",
+    "#Calculation\n",
+    "Tc2=Tc1*P2/P1;      #critical temperature(K)\n",
+    "\n",
+    "#Result\n",
+    "print \"critical temperature is\",Tc2,\"K\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 10.10, Page number 227"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 34,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "maximum critical temperature is 7.782 K\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",
+    "Hc=6*10**5;    #critical magnetic field(A/m)\n",
+    "Tc=8.7;     #critical temperature(K)\n",
+    "H0=3*10**6;   #critical magnetic field(A/m)\n",
+    "\n",
+    "#Calculation\n",
+    "T=Tc*math.sqrt(1-(Hc/H0));     #maximum critical temperature(K)\n",
+    "\n",
+    "#Result\n",
+    "print \"maximum critical temperature is\",round(T,3),\"K\"\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
+}
diff --git a/sample_notebooks/Sadananda CharyArroju/Chapter1_1.ipynb b/sample_notebooks/Sadananda CharyArroju/Chapter1_1.ipynb
new file mode 100755
index 00000000..55497994
--- /dev/null
+++ b/sample_notebooks/Sadananda CharyArroju/Chapter1_1.ipynb
@@ -0,0 +1,412 @@
+{
+ "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": 15,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "bond energy is 3.84 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=23.6*10**-10;    #equilibrium distance(m)\n",
+    "I=5.14;    #ionisation energy(eV)\n",
+    "EA=3.65;   #electron affinity(eV)\n",
+    "N=8;     #born constant\n",
+    "\n",
+    "#Calculation\n",
+    "x=1-(1/N);\n",
+    "V=(e**2)*x/(4*e*math.pi*epsilon0*r0);   #potential(V)\n",
+    "E=I-EA;        #net energy(eV)\n",
+    "BE=round(V*10,2)-E;        #bond energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"bond energy is\",BE,\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.2, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "compressibility is -25.1095 *10**14\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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.41*10**-3;    #equilibrium distance(m)\n",
+    "A=1.76;      #madelung constant\n",
+    "n=0.5;       #repulsive exponent value\n",
+    "\n",
+    "#Calculation\n",
+    "beta=72*math.pi*epsilon0*r0**4/(A*e**2*(n-1));    #compressibility\n",
+    "\n",
+    "#Result\n",
+    "print \"compressibility is\",round(beta/10**14,4),\"*10**14\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.3, Page number 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "cohesive energy is -3.065 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.314*10**-9;    #equilibrium distance(m)\n",
+    "A=1.75;      #madelung constant\n",
+    "N=5.77;     #born constant\n",
+    "I=4.1;    #ionisation energy(eV)\n",
+    "EA=3.6;   #electron affinity(eV)\n",
+    "\n",
+    "#Calculation\n",
+    "V=-A*e**2*((N-1)/N)/(4*e*math.pi*epsilon0*r0);\n",
+    "PE=round(V,2)/2;    #potential energy per ion(eV)\n",
+    "x=(I-EA)/2;\n",
+    "CE=PE+x;   #cohesive energy(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"cohesive energy is\",CE,\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.4, Page number 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 32,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "binding energy is 665.0 *10**3 kJ/kmol\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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r0=0.324*10**-9;    #equilibrium distance(m)\n",
+    "A=1.75;      #madelung constant\n",
+    "n=8.5;       #repulsive exponent value\n",
+    "\n",
+    "#Calculations\n",
+    "U0=(A*e/(4*math.pi*epsilon0*r0))*(1-1/n);     \n",
+    "U=round(U0,1)*N*e;      #binding energy(J/kmol)\n",
+    "\n",
+    "#Result\n",
+    "print \"binding energy is\",round(U/10**6),\"*10**3 kJ/kmol\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.5, Page number 11"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 36,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "density of CsClis 4.389 *10**3 kg/m**3\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "rCs=0.165*10**-9;    #radius(m)\n",
+    "rCl=0.181*10**-9;    #radius(m)\n",
+    "MCs=133;    #atomic weight\n",
+    "MCl=35.5;   #atomic weight\n",
+    "N=6.02*10**26;           #Avagadro Number\n",
+    "\n",
+    "#Calculation\n",
+    "a=2*(rCl+rCs)/math.sqrt(3);     #lattice constant(m)\n",
+    "M=(MCs+MCl)/N;       #mass of 1 molecule(kg)\n",
+    "V=a**3;    #volume of unit cell(m**3)\n",
+    "rho=M/V;    #density of CsCl(kg/m**3)\n",
+    "\n",
+    "#Result\n",
+    "print \"density of CsClis\",round(rho/10**3,3),\"*10**3 kg/m**3\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.6, Page number 12"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 37,
+   "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\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.7, Page number 12"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "energy required is -1.9 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",
+    "epsilon0=8.85*10**-12;   \n",
+    "r=0.5*10**-9;    #distance(m)\n",
+    "I=5;    #ionisation energy(eV)\n",
+    "E=4;   #electron affinity(eV)\n",
+    "\n",
+    "#Calculation\n",
+    "C=e**2/(4*math.pi*epsilon0*e*r);    #coulomb energy(eV)\n",
+    "Er=I-E-C;    #energy required(eV)\n",
+    "\n",
+    "#Result\n",
+    "print \"energy required is\",round(Er,1),\"eV\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.9, Page number 13"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 43,
+   "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": 44,
+   "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\""
+   ]
+  }
+ ],
+ "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
+}