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diff --git a/539/CH12/EX12.3/Example_12_3.sce b/539/CH12/EX12.3/Example_12_3.sce
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+//Theoretical Density Determination for NaCl
+
+clear;
+clc;
+
+printf("\tExample12.3\n");
+
+A_Na=22.99;  // in g/mol
+A_Cl=35.45;  //in g/mol
+
+r_Na=0.102*10^-7;  //in cm Radius of Na+ ion
+r_Cl=0.181*10^-7;  //in cm Radius of Cl- ion
+
+a=2*(r_Na+r_Cl);
+V=a^3;
+
+n=4;  //For FCC, no. of atoms are 4 per crystal
+
+Na=6.023*10^23;  //Avogadro number
+
+density=n*(A_Na+A_Cl)/(V*Na);
+
+printf("\nDensity is : %0.2f g/cm^3\n",density);
+
+//End
+\ No newline at end of file