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clc//
//
//
//Variable declaration
A=1.748; //madelung constant
n=9; //born repulsive exponent
e=1.602*10^-19; //charge of electron(c)
epsilon0=8.85*10^-12; //permittivity(C/Nm)
r0=0.281*10^-9; //seperation(m)
IE=5.14; //ionisation energy of A(kJ/mol)
EA=3.61; //electron affinity for B(kJ/mol)
//Calculation
CE=A*e^2*(1-(1/n))/(4*%pi*epsilon0*r0*e); //cohesive energy(eV)
//Result
printf("\n cohesive energy is %0.3f eV",CE)
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