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+//Example 2.6//
+rNa=0.098//nm // Ionic radius of Sodium (From appendix 2)
+rO=0.132//nm // // Ionic radius of Oxygen (From appendix 2)
+a0=rNa+rO//nm
+mprintf("a0 = %f nm",a0)
+k0=9*10^9;//m/C // proportionality constant
+q=1;//charge of single electron
+z1=0.16*10^-18;//C //valence of the charged ions
+z2=0.16*10^-18;//C //valence of the charged ions
+q1=-2;//charge of single electron
+a1=0.231*10^-9;//nm //separation distance between the centers of th ions
+Fc=-(k0*q*z1*q1*z2)/(a1)^2
+mprintf("\nFc = %e N",Fc)
+Fr=-Fc
+mprintf("\n Fr = %e N",Fr)