Atomic and Ionic Radii (Section)

Consider the isoelectronic ions Cl- and K+. (a) Which ion is smaller? (b) Using Equation and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff for these two ions. (c) Repeat this calculation using Slater’s rules to estimate the screening constant, S. (d) For isoelectronic ions, how are effective nuclear charge and ionic radius related?

Zeff = Z - S [7.1]