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+//Example number 7.7, Page number 148
+
+clc;clear;
+close;
+
+//Variable declaration
+epsilonr=1.0000684;     //dielectric constant
+Na=2.7*10**25;   //number of atoms
+x=1/(9*10**9);   
+E=10**6;   //electric field(V/m)
+e=1.6*10**-19;      //charge(c)
+Z=2;    //atomic number
+//Calculation
+r0=((epsilonr-1)/(4*%pi*Na))**(1/3);     //radius of electron cloud(m)
+X=x*E*r0**3/(Z*e);        //displacement(m)
+//Result
+printf("radius of electron cloud is %.2e m",r0)
+printf("\n displacement is %.4e m",X)