[填空题]
The measured binding energujyp:1( wfc b4j+ en6a s4fonxu.4aynehg 9()exl)3wpb,0t au 2n g)vtr1go( y of KCl is 4.43 eV. From the result of Problem 1, estimate the contribution to the binding energy of the repelling electron 3b)vgxt(tu)wg2 rp10 l e,o anclouds at the equilibrium distance $ r_0 = 0.28\ \text{nm} $. $PE_{\text{clouds}} =$ $\ \text{eV}$
