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NEET2004ChemistryStructure of AtomActual

Which of the following ions, has smallest size?

Options

  1. ACa ²⁺
  2. BCl ⁻
  3. CS ²⁻
  4. DK ⁺

Correct answer

A. Ca ²⁺

Step-by-step solution

Ca ²⁺, Cl ⁻, S ²⁻ and K ⁺ are isoelctronic species. In isoelectronic ions, size decrease with increasing nuclear charge. Hence, Ca ²⁺ ion is the smallest among these.

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