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JEE Main2003ChemistryStructure of AtomActual

Which one of the following groupings represents a collection of isoelectronic species? (At. nos,: 55, Br:35)

Options

  1. AN ³⁻, F ⁻, Na ⁺
  2. BBe , Al ³⁺, Cl ⁻
  3. CCa ²⁺, Cs ⁺, Br
  4. DNa ⁺, Ca ²⁺, Mg ²⁺

Correct answer

A. N ³⁻, F ⁻, Na ⁺

Step-by-step solution

N ³⁻, F ⁻ and Na ⁺ contain 10 electrons each.

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