1.

Consider the isoelectronic ions K+ ,S2- ,Cl- and Ca2+The radii of these ionic species follow the order (a) Ca2+> K+ > Cl- >S2- (b) Cl- > S2- > K+ > Ca2+ (c) S2- >Cl-  >K+ >Ca2+ (d) K+ > Ca2+ > S2- > Cl- 

Answer»

Correct option is (C) S2- >Cl-  >K+ >Ca2+ 

Isoelectronic species are those species which have same number of electrons. 

As all the given elements are isoelectronic with each other. 

Thus, the radii/size of isoelectronic species is inversely proportional to the atomic number, i.e. size \(\propto \frac{1}{Z}\)

Thus, the correct order is  S2- >Cl-  >K+ >Ca2+ 


Discussion

No Comment Found

Related InterviewSolutions