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diff --git a/Electronics_Devices_And_Circuits_by_S_Salivahanan/1-Physical_properties_of_elements.ipynb b/Electronics_Devices_And_Circuits_by_S_Salivahanan/1-Physical_properties_of_elements.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 1: Physical properties of elements"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.1: Finding_radii.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1.1.\n",
+"format(6)\n",
+"epsilon=8.854*10^-12\n",
+"h=6.62*10^-34 //planck's constant\n",
+"m=9.1*10^-31 //mass of electron\n",
+"q=1.6*10^-19 //charge of electron\n",
+"for n=1\n",
+"r1=(epsilon*(h^2)*(n^2))/(%pi*m*(q^2)) //radius of 1st orbit for hydrogen\n",
+"x1=r1*10^10  // in A.U\n",
+"disp(x1,'r1(A.U)=')\n",
+"end\n",
+"for n=2\n",
+"r2=(epsilon*(h^2)*(n^2))/(%pi*m*(q^2)) //radius of 2st orbit for hydrogen\n",
+"x2=r2*10^10  // in A.U\n",
+"disp(x2,'r2(meters)=')\n",
+"end\n",
+"for n=3\n",
+"r3=(epsilon*(h^2)*(n^2))/(%pi*m*(q^2)) //radius of 3st orbit for hydrogen\n",
+"x3=r3*10^10  // in A.U\n",
+"disp(x3,'r3(meters)=')\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.2: Finding_wavelength.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1.2.\n",
+"format(7)\n",
+"E1=-13.6; //energy of 10th state\n",
+"E10=-13.6/10^2; //enery in the ground state\n",
+"lamda=12400/(E10-E1); //wavelength of emitted photon\n",
+"disp('The wavelength in Armstrong units is given by, lamda = 12400 / E2-E1')\n",
+"disp('Since the hydrogen atoms goes from n=10 state to the ground state, lamda = 12400 / E10-E1')\n",
+"disp('The energy of the 10th state is E10 = -13.6 / 10^2 = -0.136 eV')\n",
+"disp('The energy in the ground state is E1 = -13.6 eV')\n",
+"disp(lamda,'Wavelenth of the emitted photon is(Armstrong) =');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 1.3: wavelength_of_the_Balmer_series.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Example 1.3.\n",
+"format(6)\n",
+"Einfinity=0 //energy of electron at infinite orbit\n",
+"E2=-13.6/2^2 //energy of electron at second orbit\n",
+"wavelength=12400/(Einfinity-E2) //wavelength limit\n",
+"disp('Wavelength of the Balmer series limit = 12400 / Einfinity-E2')\n",
+"disp('Energy of the electron at the infinity orbit, Einfinity = -13.6 / infinity^2 = 0')\n",
+"disp('Energy of the electron at the second orbit, E2 = -13.6 / 2^2 = -3.4')\n",
+"disp(wavelength,'the wavelength limit(A.U) = 12400 / Einfinity-E2 =')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}