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diff --git a/3020/CH13/EX13.20/ex13_20.sce b/3020/CH13/EX13.20/ex13_20.sce
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+clc;
+clear all;
+rho = 7860;//Density of alpha-iron in Kg/m^3
+M = 55.85e-3; // Atomic weight of alpha-iron in Kg
+n = 2;// Number of atoms per unit cell of BCC
+N = 6.022e26; // Avagadro constant
+a = ((n*M)/(N*rho))^(1/3);//Lattice constant
+r = ((a*sqrt(3))/4);
+disp('m',r,'The atomic radius of alpha-iron is')