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JEE Main2010ChemistryStructure of AtomActual

The correct sequence which shows decreasing order of the ionic radii of the elements is

Options

  1. AAl ³⁺> Mg ²⁺> Na ⁺> F ⁻> O ²⁻
  2. BNa ⁺> Mg ²⁺> Al ³⁺> O ²⁻> F
  3. CNa ⁺> F > Mg ²⁺> O ²⁻> Al ³⁺
  4. DO ²⁻> F > Na ⁺> Mg ²⁺> Al ³⁺

Correct answer

D. O ²⁻> F > Na ⁺> Mg ²⁺> Al ³⁺

Step-by-step solution

For isoelectronic species higher the Z e ratio, smaller the ionic radius z e for aligned & O ²⁻= 8 10 =0.8 & ~F ⁻= 9 10 =0.9 & Na ⁺= 11 10 =1.1 & Mg ²⁺= 12 10 =1.2 & Al ³⁺= 13 10 =1.3 aligned

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