Multiple choice

K+ , Cl-, Ca2+ and S2- ions are isoelectronic. The decreasing order of their size is

  1. S2- > Cl- > K+ > Ca2+

  2. Ca2+ > K+ > Cl- > S2-

  3. K+ > Cl- > Ca2+ > S2-

  4. Cl- > S2- > Ca2+ > K+
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A Correct answer
Explanation

All the ions are isoelectronic. They contain same number of electronic shells. Hence the size decreases with the increase in nuclearcharge (atomic number). So the correct order is given in option 1

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