Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties

Question

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?

  • Mg2+ < Be2+ < K+ < Ca2+

  • Be2+ < K+ < Ca2+ < Mg2+

  • K+ < Ca2+ < Mg2+ < Be2+

  • Ca2+ < Mg2+ < Be2+ < K+

Answer

C.

K+ < Ca2+ < Mg2+ < Be2+

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