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BITSAT2011ChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of radii is

Options

  1. AN < Be < B
  2. BF ⁻< O ²⁻< N ³⁻
  3. CNa < L ₁< K
  4. DFe ³⁺< Fe ²⁺< Fe ⁴⁺

Correct answer

B. F ⁻< O ²⁻< N ³⁻

Step-by-step solution

Effective nuclear charge (i,e. Z/e ratio) decreases from F ⁻ to N ³⁻ hence the radii follows the order: F ⁻< O ²⁻< N ³⁻ . Z / e for F ⁻=9 / 10=0.9, for O ²⁻=8 / 10=.8, for N ³⁻=0.7

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