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diff --git a/3636/CH2/EX2.3/Ex2_3.sce b/3636/CH2/EX2.3/Ex2_3.sce
new file mode 100644
index 000000000..039dbc5e8
--- /dev/null
+++ b/3636/CH2/EX2.3/Ex2_3.sce
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+clear;
+clc;
+//Atomic weigths
+Si=28.1 
+Ga=69.7
+As=74.9
+Na=6.02*10^23 // Avagadro Number in mol^-1
+//(a)Si
+a=5.43*10^-8 //in cm
+n=8 //no. of atoms/cell
+
+//(b)GaAs
+a1=5.65*10^-8 //in cm
+
+//Calculation 
+N=8/a^3 //Atomic Concentration in atoms/cc
+N1=4/a1^3 //Atomic Concentration in atoms/cc
+Density=(N*Si)/(Na)
+Density1=(N1*(Ga+As))/(Na)
+
+mprintf("Density of Si= %1.2f g/cm^3\n",Density)
+mprintf("Density of GaAs= %1.2f g/cm^3",Density1)