Multiple choice

Correct order of decreasing ionic size for K+, Ca2+, Cl– and S-- is

  1. K+ > Ca++ > Cl- > S--

  2. Ca++ > K+ > Cl– > S--

  3. K+ > Ca++ > Cl– > S--

  4. Cl– > S-- > Ca++ > K+

  5. S-- > Cl– > K+ > Ca++
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E Correct answer
Explanation

All are isoelectronic species having twenty electrons each. In isoelectronic species, ionic size decreases with increase in atomic number. So, the correct order of ionic size is S-- > Cl– > K+ > Ca++.

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