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diff --git a/1985/CH13/EX13.2/Chapter13_example2.sce b/1985/CH13/EX13.2/Chapter13_example2.sce
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+clc
+clear
+//Input data
+d=9.6*10^2//Density of sodium in kg/m^3
+a=23//Atomic weight of sodium 
+n=2//Number of atoms present in one unit cell in bcc crystal
+x=6.023*10^26//Avagadro constant per kg mole
+
+//Calculations
+m=(n*a)/x//Mass of one unit cell in kg
+a1=(m/d)^(1/3)/10^-10//Lattice constant of sodium angstroms
+
+//Output
+printf('The lattice constant for sodium crystal is %3.1f angstroms',a1)