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AP EAMCET201822 Apr 2018Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Which of the following represents the correct order of ionic radii?

Options

  1. AAl ³⁺> Mg ²⁺> Na ⁺> O ²⁻> F ⁻
  2. BO ²⁻> F ⁻> Na ⁺> Mg ²⁺> Al ³⁺
  3. CMg ²⁺> Al ³⁺> O ²⁻> F ⁻> Na ⁺
  4. DO ²⁻> F ⁻> Al ³⁺> Mg ²⁺> Na ⁺

Correct answer

B. O ²⁻> F ⁻> Na ⁺> Mg ²⁺> Al ³⁺

Step-by-step solution

InO ²⁻> F ⁻> Na ⁺> Mg ²⁺> Al ³⁺ All these ions have neon configuration 1 s^2, 2 s^2, 2 p^6 but different nuclear charges, that is why, they are isoelectronic species (different species having the same number and configuration of electrons). To understand the decrease in radius from O ²⁻ to Al ³⁺ . The ionic radii of isoelectronic species increases, with a decrease in magnitudes of nuclear charge. Nuclear charge =+8,+9,+11,+12,+13

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