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clear
//
//
//
//Variable declaration
e=1.6*10**-19 //charge(coulomb)
r0=0.281*10**-9 //equilibrium distance(m)
a=1.748*10**-28 //madelung constant(J m**2)
n=9 //repulsive exponent value
m=1
//Calculations
Ur0=-a*(1-m/n)/(e*r0**m) //cohesive energy of NaCl(eV)
//Result
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