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BITSAT2013ChemistryClassification of Elements and Periodicity in PropertiesActual

The ions O ²⁻, F ⁻, Na ⁺, Mg ²⁺ and Al ³⁺ are isoelectronic. Their ionic radii show:

Options

  1. AA decrease from O ²⁻ to F ⁻ and then increase from Na ⁺ to Al ³⁺
  2. BA significant increase from O ²⁻ to Al ³⁺
  3. CA significant decrease from O ²⁻ to Al ³⁺
  4. DAn increase from O ²⁻ to F ⁻ and then decrease from Na ⁺ to Al ³⁺

Correct answer

C. A significant decrease from O ²⁻ to Al ³⁺

Step-by-step solution

Amongst isoelectronic species, ionic radii of anion is more than that of cations. Further size of anion increase with increase in -ve charge and size of cation decrease with increase in + ve charge. Hence ionic radii decreases from O ⁻ to Al ³⁺

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