The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

  • Option 1)

    Ca2+ < K+ < Ar

  • Option 2)

    K+ < Ar < Ca2+

  • Option 3)

    Ar < K+ < Ca2+

  • Option 4)

    Ca2+ <Ar < K+

 

Answers (1)

 

Size of isoelectronic species -

Smaller the value of  z/e, larger the size of that species.Smaller z means effective nuclear charge is small hence size is large.

-

 

 In case of isoelectronic species, radius decreases with increase in nuclear charge 


Option 1)

Ca2+ < K+ < Ar

Option is correct

Option 2)

K+ < Ar < Ca2+

Option is incorrect

Option 3)

Ar < K+ < Ca2+

Option is incorrect

Option 4)

Ca2+ <Ar < K+

Option is incorrect

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