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KCET2018ChemistryClassification of Elements and Periodicity in Properties

Which of the following is the correct order of radius?

Options

  1. A( H ⁻> H > H ⁺ )
  2. B( Na ⁺> F ⁻> O ²⁻ )
  3. C( F ⁻> O ²⁻> Na ⁺ )
  4. D( Al ³⁺> Mg ²⁺> N ³⁻ )

Correct answer

A. ( H ⁻> H > H ⁺ )

Step-by-step solution

The size of anion is always higher than that of the parentatom due to the decrease in effective nuclear charge on anion ( (Z_ eff ) ) while, the size of cation is always smaller than parent atom due to lesser ( (Z_ eff ) ) than parent atom. Hence, the correct given order is ( H⁻>H>H⁺ )

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