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AP EAMCET202123 Aug 2021Morning ShiftChemistryStructure of AtomActual

The ions S ²⁻, Cl ⁻, K ⁺, Ca ²⁺ are isoelectronic. Their ionic radii show

Options

  1. Aa decrease from S ²⁻ to Cl ⁻ and then increase from K ⁺ to Ca ²⁺
  2. Ban increase from S ²⁻ to Cl ⁻ and then decrease from K ⁺ to Ca ²⁺
  3. Ca significant decrease from S ²⁻ to Ca ²⁺
  4. Da significant increase from S ²⁻ to Ca ²⁺

Correct answer

C. a significant decrease from S ²⁻ to Ca ²⁺

Step-by-step solution

For isoelectronic species, the ionic radii decrease with increase in nuclear charge. So, the cation with greater + ve charge i.e. Ca ²⁺ will have smaller radius and the anion with greater - ve charge i.e. S ²⁻ will have a larger radius. The ionic radii show a significant decrease from S ²⁻ to Ca ²⁺ .

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