Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties

Question

The increasing order of the ionic radii of the given isoelectronic species is 

  • Cl-, Ca2+, K+, S2-

  • S2-, Cl-, Ca2+,K+

  • Ca2+, K+, Cl-, S2-

  • K+, S2-,Ca2+,Cl-

Answer

C.

Ca2+, K+, Cl-, S2-

For isoelectronic species, as the z/e decreases, ionic radius increases
such as Ionic space radii space proportional to space 1 over straight z

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