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diff --git a/Modern_Physics_By_G.Aruldas/Chapter21.ipynb b/Modern_Physics_By_G.Aruldas/Chapter21.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:42eb4bd0fae1331d52fd855bad43219acea712dc31c5270f1f64fa698ba366ad"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "21: Elementary particles"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 21.1, Page number 399"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mpi=140;     #mass of pi-meson\n",
+      "mp=938.3;    #mass of proton\n",
+      "mk=498;   #mass of k\n",
+      "m=1116;  \n",
+      "\n",
+      "#Calculation\n",
+      "Q=mpi+mp-mk-m;    #Q-value(MeV)\n",
+      "\n",
+      "#Result\n",
+      "print \"Q-value is\",round(Q),\"MeV\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Q-value is -536.0 MeV\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example number 21.2, Page number 399"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#importing modules\n",
+      "import math\n",
+      "from __future__ import division\n",
+      "\n",
+      "#Variable declaration\n",
+      "mpc2=938.3;    #energy of proton(MeV)\n",
+      "Epic2=139.6;   #energy of pi-meson(MeV)\n",
+      "mnc2=939.6;    #energy of neutron(MeV)\n",
+      "KE=0.6;    #kinetic energy of neutron(MeV)\n",
+      "\n",
+      "#Calculation\n",
+      "Epi=mpc2+Epic2-mnc2-KE;    #energy conservation(MeV)\n",
+      "mpic2=math.sqrt((Epi**2)-((mnc2+KE)**2)+(mnc2**2));   #pi0 mass(MeV)\n",
+      "\n",
+      "#Result\n",
+      "print \"pi0 mass is\",round(mpic2,1),\"MeV\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "pi0 mass is 133.5 MeV\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file