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diff --git a/1367/CH4/EX4.3/4_3.sce b/1367/CH4/EX4.3/4_3.sce
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+//Find Lattice constant and atomic packing fraction of NaCl having FCC structure
+//Ex:4.3
+clc;
+clear;
+close;
+r_na=0.98;//ionic radius of sodium in angstorm
+r_cl=1.81;//ionic radius of chlorine in angstorm
+n=4;//in fcc there are 4 Na and 4 Cl ions
+a=((2*r_na)+(2*r_cl));//latice constant
+disp(a,"Lattice constant = ");
+apf=((n*(4/3)*3.14*r_na^3)+(n*(4/3)*3.14*r_cl^3))/a^3;
+disp(apf,"atomic packing fraction of NaCl having FCC structure = ");
+\ No newline at end of file