Multiple choice

Which of the following iso-electronic species has the correct order of the size of ions?

  1. P-3 > S-2 > Cl- > Ar > K+ > Ca+2

  2. P-3 < S-2 < Cl- < Ar < K+ < Ca+2

  3. Ar > K+ > Ca+2> P-3 > S-2 > Cl-

  4. Ar > K+ > Ca+2 > P-3 > S-2 > Cl-

  5. None of these
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A Correct answer
Explanation

Size of iso-electronic species ∝ 1/(Nuclear charge) This is quite clear from the following iso-electronic species, which contains a total of 18 electrons. Iso-electronic species with 18e- is arranged in the decreasing order of size is: P-3 > S-2 > Cl- > Ar > K+ > Ca+2.

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