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+//Example number 2.8, Page number 34
+clc;clear;
+close;
+
+// Variable declaration
+N=6.023*10**23;           // Avagadro Number
+Mw=23+35.5;        // molecular weight of NaCl
+rho=2.18;    // density(gm/cm**3)
+
+// Calculation
+M=Mw/N;        // mass of 1 molecule(gm)
+Nv=rho/M;      // number of molecules per unit volume(mole/cm**3)
+Na=2*Nv;     // number of atoms
+a=(1/Na)**(1/3)*10**8;   // distance between atoms(angstrom)
+
+// Result
+printf( "distance between atoms is %.2f Angstrom",a)
+