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+//chapter 2
+//example 2.6
+//calculate packing fraction and density
+//page 43
+clear;
+clc;
+//given
+r_Na=0.98; // in Angstrom (radius of sodium ion)
+r_Cl=1.81; // in Angstrom (radius of chloride ion)
+M_Na=22.99; // in amu (atomic mass of sodium)
+M_Cl=35.45; // in amu (atomic mass of chlorine)
+//calculate
+a=2*(r_Na+r_Cl); // lattice parameter
+printf('\nLattice constant  is \ta=%.2f Angstrom',a);
+//PF=volume of ions present in the unit cell/volume of unit cell
+PF=((4*(4/3)*%pi)*r_Na^3+(4*(4/3)*%pi)*r_Cl^3)/a^3;
+printf('\nPacking fraction is %.3f',PF);
+//Density=mass of unit cell/volume of unit cell
+p=4*(M_Na+M_Cl)*1.66E-27/(a*1E-10)^3;
+printf('\nDensity is \tp=%.f Kg/m^3',p);
+p=p*1E-3; //changing unit to gm/cm^-3
+printf('\nDensity is \tp=%.2f g/cm^3',p);