[填空题]
The measured binding energy of KCl is9hege3a6ii 3h 4.43 eV. Fd.xt++po: cg trom the result of Problem 1, estimate the contribution to the binding energy of the repelling electron clouds at o+:p.g+d txct the equilibrium distance $ r_0 = 0.28\ \text{nm} $. $PE_{\text{clouds}} =$ $\ \text{eV}$
